I just checked the github page and it seems this bug is low priority:
Memmy does sometimes not let you post or comment due to a weird bug that thinks you‘re posting in the wrong language.
I just want to point out that I‘ve had this bug twice so far and others (maybe many) will have it too which severely hinders the growth of lemmy at this critical time.
If someone reads this who has any clout, stuff like this is what can trip a promising platform like this. Exponential growth and all.
Have a good one.
This has happened to me as well, I cannot comment in one of the communities anymore. I tried to change the language in the settings on my account, no effect. Right now I’ve uninstalled Memmy and I’m using a different IPhone app to post.
The dev is rolling out an update pretty soon. Lets hope that does it. Thank you for letting me know.