Auto-update does not work?

I have auto-update enabled on my desktop (Windows 10) but the browser still has a popup message that asks me to "restart to install updates" every time I open it. It says the updates install successfully, but next time I go on Firefox it wants me to close and reopen the app again. Auto-updates are, as stated, enabled, and it should be able to update in the background, but it doesn't. Is it something wrong with my instance of Firefox, or maybe my desktop has some settings wrong?? I have disabled and re-enabled auto-updates, and restarted my computer, just to get the basic fixes out of the way lol. The updates work just fine on my laptop (also Windows 10) btw.

Thanks for looking!