Can't reply to kbin accounts

Hi everyone! I've noticed for a while now that I can't reply to comments made by kbin accounts using my account here. Not even talking about kbin threads, but for example if I reply to any kbin-made comment over on feddit.de, once I click submit it just keeps spinning without ever posting the reply. I often see users from other lemmy instances replying to them though, so it doesn't seem like a general lemmy problem. Does everyone else here have this problem as well?