I had the same trouble.
I tried to post in Chat and had News/Activism topics come up.
Then it deleted the title and I had to reenter it.
Then the date got moved to the wrong field.
Then it didn’t recognize the topics and I had to reneter THEM.
Finally, it posted in News/Activism instead of Chat.....twice.
I thought it was just me, being sleep deprived since DH has been out of town this week and I’m alone with the twins and Maya—glad it wasn’t my fault! :-)