Bottom left bit with ‘Advertisement’ – that’ll be it probably 😉
Adverts aren’t controlled much by the sites and they come in targeted based on cookies on your PC so people see different things to each other. You might be getting some that are broken and are messing up the styles on the page. You could clear your cookies, or try to find those that are ad based and delete those (there are tools for this I think).
That there’s no advert there in that space suggests broken ad or that you’ve got an extension or some other software blocking adverts (which won’t go down well with the powers here 😉 . If the latter you could just put up with the ads, or pay up for a subscription to remove them 😛 ).
Its also happening on an a 10 year old XP PC
End of life operating system there! I’d be wary of running it at least because it’s likely getting no updates and increasing in vulnerability.