article can't be edited after the annotation is converted, it works after restarting article

This is what normal work looks like:
https://s3.amazonaws.com/zotero.org/images/forums/u16529185/0m03eparz674359jfzww.png
The problem arises when I try to convert the colored blocks to underlines, I can no longer edit the article: the editing bar disappears:
https://s3.amazonaws.com/zotero.org/images/forums/u16529185/ftj1o17ypy9koss1g2n7.png
the version is 7.0.13 on windows.
it doesn't influence the use but it maybe bug.
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