Unless I am mistaken it looks like a book set with the ‘commission’ field at ‘0.05%’ (0.0005) actually uses ‘5%’ (0.05)
If I am right, this is new from this week.
See my “submit a request” message via the contact part of the website (incl screenshot).
This bug is still there as I am rebalancing now. I can confirm that it is a matter of 0.0x% interpreted as x%.
(this time I am doing it with another book that has 0.04% and yet it applies a commission of 4%)
It was working in the past…
For the moment, I am going to use the setting as fixed commission $2