Not completely true, see here: Tags must qualify for a badge by being actually used enough.

More information on tag badges: meta.stackexchange.com/questions/67397/…

I'm speaking from experience. Nothing like noticing some stupid self-written userscript broke the site after you ping SE employees :-(

Related.

Try disabling userscripts.

Sounds too minor. Both the user's edits (if that's all there is to them) and your improvement. This is just personal preference.

I love how @JourneymanGeek's comment and the first answer illustrate the problem.

Question looks reasonable enough now.

Related

You can probably just click through to the question and look for the post you're reviewing.

There are only two answers of yours that haven't been up voted, accepted, and have no competition. One of those is on a migrated question where the user asking it has no account to vote or accept with on Super User (hence no link to a profile).