That is very odd. I am going to try replying and editing with this post using my test account. It has identical setup to ordinary members, without any special access.
This is an edit where I am adding a new line.
This is my third edit, so I don’t think it is editing that triggers the spam filter.
My suspicision is there is something in the post that is causing the spam filter to be over aggressive. I am not sure there is anything that can be easily done, but I will note it in the log for the website developer.