I don't know if it's been reported yet, but the website breaks down regularly. I last tried a Chrome version 73.0.3683.103 in guest mode.

In Firefox 66.0.2 I have the same problem.

How to reproduce the bug: You open a page like "https://www.speedrun.com/ff8". There you click back and forth between the different categories. This is more likely if you switch between the different categories under "More...". At some point the CSS goes crazy and one of the following scenarios occurs:

1. navigation elements are on top of each other, it's hard to click something.
2. the page seems to repair itself, but in the DOM you can see the background moving 0.5 pixels to the left in a short interval.

I think in the second case a rule is applied which should be set if there is no background, because the background image disappears for a short time.

If the first case occurs, it is possible that the page still goes over to case 2. After case 2 I haven't found anything yet.

This can be observed everywhere on the website and not only at /ff8. There I could best recreate it (I tried it at /smo).

I hope this helps with the troubleshooting.

E: I just tried to reproduce it but it seems like this is fixed now.