Screenshot with added red line (which I tried to make vertical):
The left alignment is deficient.
Is it a site problem?
As reported in comments, (initially triggered by this additional image:)
at least the amount of additional indentation seems to be decided by the styling of the number of answers: the shortest is "1 answer" (whether it has been accepted or not), then "0 answers" is wider although unframed, and "2 (or more) answers" is even wider due to its framing (be it filled or not).
https://tex.stackexchange.com/questions/ the layout is vertical, and I perceive no raggedness, did not check thoroughly though. The horizontal layout of
https://tex.stackexchange.com/ is an ingredient of this issue.
As pointed out in comment by @samcarter, this is network-wide problem as one can see at