This bug is caused by load.php and only happens on Wikimedia Commons File: pages.

Steps to replicate the issue (include links if applicable):

• Go onto any File: page on Wikimedia Commons, such as https://commons.wikimedia.org/wiki/File:Sponge-viscose.jpg
• Scroll part way down the image
• Refresh the page
• Bug occurs when the page finishes reloading (see below)

What happens?:

• After the page reloads, the entire page slowly scroll upwards for about 1.5s (video linked below)
• If the page is repeatedly refreshed, it repeats scrolling upwards until eventually reaching the top

What should have happened instead?:

• After the page reloads, it shouldn't move around

Software version (skip for WMF-hosted wikis like Wikipedia):

Other information (browser name/version, screenshots, etc.):

• Here is a screen recording of it happening: https://archive.org/download/c9sm2/wiki.webm
• The issue happens in the skins "Vector(2022/2010)" and "Timeless"; but not "MinervaNeue" nor "Monobook".
• My OS is Linux Mint 20.2
• My browser is Firefox 95.0 (most recent in my Software Manager). I disabled all addons while troubleshooting.
• I have asked about it on Village Pump and another user has confirmed they experience the same problem: https://commons.wikimedia.org/wiki/Commons:Village_pump/Technical#Page_scrolls_upwards_after_refresh
• Disabling Javascript, or blocking commons.wikimedia.org/w/load.php in uBlock prevents it from happening