Fees are calculated based on max amount of XMR 
Traders are paying fees based on the offer's maximum amount of XMR to sell/buy. 

So if someone posts offer min 1 XMR & max 100 XMR on 1% fee Haveno instance, traders would have to pay 1 XMR fee regardless of how much XMR traded, which can result in paying 50% fee.

This also would worsen the liquidity problem.