When in an anvil, I can select the name field and edit it, but no cost appears, nor does the renamed item in the third slot for me to take it out so I can finish renaming it.

I cannot name anything I've tried, so it is not just a nametag issue.

I've broken and replaced the anvil, and everything is the same. 

This is happening to some, but not all, people on the realm I'm struggling with it in.

Oddly enough, it's fixed itself just before posting this, when I went to grab a screenshot, despite nothing changing since I logged in originally. It's definitely on ongoing issue though, if not a consistent one. Will update if it happens again.