sometimes blocks don't accounted
Hello. @ 1st, thanks for this project!
I began mining and suddenly noticed that not all blocks were registered and payed out. For ex this block @ height [2480250](https://xmrchain.net/block/35461e32bc1b0949fd26bf269a01e49a7152a5042c1ac12a15c90dc3f8805f6f) doesn't exist in https://p2pool.observer/ 's stats, but does here: https://p2pool.io/#blocks
![image](https://user-images.githubusercontent.com/93492811/139601355-a10c196b-9129-4056-945a-046c80d47cd1.png)
![image](https://user-images.githubusercontent.com/93492811/139601074-ef314502-fd81-4c87-888e-ea5e2b1f962e.png)
As you can see the block '2480250' doesn't exist nor at global stats  nor at my address page:
![image](https://user-images.githubusercontent.com/93492811/139601030-bf46315e-1448-4511-b8fe-daba3c4ac1d3.png)

So @ 1st I pressed F5 and still couldn't see any changes. Then I checked my balance out, same sh...t.
It's so strange because I had a share of that block and it was really mined and wasn't marked as orphan or uncle:
```
NOTICE  2021-10-27 15:26:12.6607 StratumServer SHARE FOUND: mainchain height 2480208, diff 551164384, client 127.0.0.1:58315 user Ryzen, effort 53.382%
NOTICE  2021-10-27 16:18:02.3482 SideChain add_external_block: block 3612824a619dadb714c0f27c648837be8ee7cf4580b4d8cf100677e9a05957d0 has enough PoW for Monero network, submitting it
NOTICE  2021-10-27 16:18:02.3482 P2Pool submit_block: height = 2480229, external blob (3289 bytes)
NOTICE  2021-10-27 16:18:02.4732 P2Pool BLOCK FOUND: main chain block at height 2480229 was mined by this p2pool
-----------------------------------------------------------------------------------------------
| ######   #        #######   #####   #    #      #######  #######  #     #  #     #  ######  |
| #     #  #        #     #  #     #  #   #       #        #     #  #     #  ##    #  #     # |
| #     #  #        #     #  #        #  #        #        #     #  #     #  # #   #  #     # |
| ######   #        #     #  #        ###         #####    #     #  #     #  #  #  #  #     # |
| #     #  #        #     #  #        #  #        #        #     #  #     #  #   # #  #     # |
| #     #  #        #     #  #     #  #   #       #        #     #  #     #  #    ##  #     # |
| ######   #######  #######   #####   #    #      #        #######   #####   #     #  ######  |
-----------------------------------------------------------------------------------------------
NOTICE  2021-10-27 16:18:03.6607 P2Pool submit_block: BLOCK ACCEPTED at height 2480229 and difficulty = 324788464698
NOTICE  2021-10-27 16:58:10.5513 SideChain add_external_block: block 1b9a158606234ea69bf93b4c9b8226cc3e2aebaab476d4e2e27f106c400bfa12 has enough PoW for Monero network, submitting it
NOTICE  2021-10-27 16:58:10.5513 P2Pool submit_block: height = 2480250, external blob (5301 bytes)
NOTICE  2021-10-27 16:58:11.5669 P2Pool BLOCK FOUND: main chain block at height 2480250 was mined by this p2pool
-----------------------------------------------------------------------------------------------
| ######   #        #######   #####   #    #      #######  #######  #     #  #     #  ######  |
| #     #  #        #     #  #     #  #   #       #        #     #  #     #  ##    #  #     # |
| #     #  #        #     #  #        #  #        #        #     #  #     #  # #   #  #     # |
| ######   #        #     #  #        ###         #####    #     #  #     #  #  #  #  #     # |
| #     #  #        #     #  #        #  #        #        #     #  #     #  #   # #  #     # |
| #     #  #        #     #  #     #  #   #       #        #     #  #     #  #    ##  #     # |
| ######   #######  #######   #####   #    #      #        #######   #####   #     #  ######  |
-----------------------------------------------------------------------------------------------
NOTICE  2021-10-27 16:58:12.8794 P2Pool submit_block: BLOCK ACCEPTED at height 2480250 and difficulty = 325161736360
NOTICE  2021-10-27 17:36:34.7349 SideChain status
Main chain height         = 2480270
Main chain hashrate       = 2.719 GH/s
Side chain height         = 480113
Side chain hashrate       = 53.109 MH/s
Your hashrate (pool-side) = 23.882 KH/s
PPLNS window              = 2160 blocks (+65 uncles, 5 orphans)
Your shares               = 1 blocks (+0 uncles, 0 orphans)
Your shares position      = [..........1...................]
```
(sorry i couldn't post this on time due to technical issues with this platform and I can't find a spoiler tag here)
As you can see only one share is in pplns that was found @ 2021-10-27 15:26:12.6607, but only one block at height 2480229 was payed out, and next block at height 2480250 was ignored though my pplns-window is still opened. Can you explain what happened? I've been watching my stats with p2pool for last two weeks every day and didn't notice such things...
By the way there were several missed blocks at that time. So it could have been more than once.
Thanks, i really appreciate your work!