I have also noticed this, and it seems to happen when a question gets reopened, it shows the last person to interact with the question ( besides the closing/reopening activity) as the one that currently changed something.
I suppose the reason might be so the question gets bumped to the top of the list.
If you look the in the edit history the last activity was the following, which happened right around the time it has near your name.
Post Reopened by RolandiXor♦
Which is the name I would expect to see for the last edit/change/activity, except that activity is not directly changing the question or answers.