You may have to check with the devs but the character sheets for warlock only have 6 slots for favor but it seems like demiplane let’s you put a lot more I had a player try to use 9 in one go last night seemed not quite right to me.
Thanks for the request. I’ve got a ticket in for us to investigate this further.
We’re going to check with Darrington Press to see if favor is meant to be capped at 6 but from our reading of it the 6 bubbles for favor on the sheet seem to be because of space concerns rather than a hard limitation.