This is a repeating behavior of odoo forum page, I asked the same before and I didn't get a proper response. We are facing the same issues while trying to edit our answers or converting comment to answers.
See my prev question here
https://www.odoo.com/forum/help-1/question/400-bad-request-on-odoo-forum-118289
While I am trying to answer the same I am getting the same response.
