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I think.
I would place a fair bet that you're on a computer with a reasonably high res monitor and that it was the last post, and it couldn't scroll down until the comment was aligned with the top because there just wasn't enough content below the comment to allow it to do so.
Please stop reporting this. It isn't a bug, it's how web browsers work and I cannot fix all the web browsers. I've tested the prior page, in several browsers, on large screens, and none of them exhibit the issue because all page assets load in time and there is adequate space at the bottom... or, we're talking about the last 2 posts as my monitor is large.
It really is not a bug, it cannot and won't be fixed.
And if anyone suggests an onLoad() JavaScript function that applies a scrollTo(), please fuck off. It doesn't work, and would upset far far more people than just acknowledging how web browsers work.
And finally... LFGSS on vBulletin never had a workaround for this, the issue was there too, nothing has changed in this regard. It is how browsers work.
Did you visit the last post on the page? And then see that it wasn't lined up with the top of the screen?
The last post may not have enough space below it to have allowed the page to scroll down far enough to align the top of the comment with the top of your screen.