Cant add tags for new questions from admin area

I am trying to bulk add some questions/answers from our old system. As a result, i need to enter the question but set a different user as the author and also do the same for the answers. I am doing this just fine from the admin area, but I can’t set any tags. If i click the box of any of the tags from the admin area, they wont save. They wont save from a new post and for an edit. If i ask a question from the front end i can set the tags fine. Since there is no way for me to set the author of the question from the front end submission, I cant really do this as it is super slow to have to go in there and modify the author manually all the time.
Have I missed something here?