I'm not sure what could cause this, maybe you lost the permissions to comment? I'm sure youtube has some sort of system to prevent "spam comments". No doubt it's a mistake.
I have had this same problem for a month now when i leave comments for the channels i am subscribed to on my phone where i had no problem before. I think it is a tech problem on youtube.
Good that your issue was solved.
One thing I'll add for anyone reading: you can definitely have your comments filtered out if they are spammy.
I recently went into my spam folder and found a bunch of comments from people who simply had words like "channel" and "my video" etc.
I didn't add any filter against this. Youtube did it automatically.
So be sure to always leave relevant comments on other people's videos.
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