Sounds like they forgot to change it to use it's own config folders or something and it's sharing with Firefox which screws both up.
Firefox
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Well there is .floorp and .var/floorp for it's files, so I'm really not sure what they did, I suspect they left a few code calls to something Mozilla and that's where the problem lays
Is it running on Windows? Floorp devs should immediately fix the issue to avoid getting trouble with other Gecko browsers.
I have been running it for several weeks now and haven’t had any problems. I still use Firefox for things that don’t work well in a Flatpack environment, and Firefox works and syncs as expected. I don’t use a Start page or sync open tabs though.
Floorp shouldn't be considered honestly
In what way? It has some nice features that I'd like to see in Firefox after all