@bybpow
No, definitely not normal. I have been experiencing this for about a week too - but because of the nature of the issue, I'm not sure anyone can see the threads opened to alert people of them.
https://kbin.social/m/kbinMeta/t/364055/Unable-to-post-Thread-or-Photo
https://kbin.social/m/kbinMeta/t/339900/Had-trouble-posting-but-I-renewed-my-IP-address-and
Hmm, I had 'exploding-heads' blocked. I unblocked that domain and now I am able to see the old thread I posted while logged in. Very weird.
I still get the error when creating new threads, but they do show up now.