There is some case where high percentages can be given over the amount of trade.
If the amount is very small, mining rates represent a high percentage of the total. The minimum of Bisq’s fees is also applied, all of which leads to raising the percentage. Can be seen in the offer in red.
I have used these formulas
Maker fee = Max (0.0002,0.002 * Amount * SQRT (distance)) + Tx
Taker fee = Max (0.0002,0.003 * Amount) + (3 * Tx)
(Tx = 0.0003)
When the amount is very small, and also the distance to the market price is somewhat high (7.73%), the maker will pay 2% (5% with mining fees) and taker 2% (11% with mining fees)
Perhaps this circumstance explains some queries about this. When the distance is below those values and the amount is at least 0.1 the rates will be around 0.3% (0.6% with mining rates) for the maker and 0.3% (1.2% with mining rates)