I cannot create giveaways anymore :(

I don't think Ive seen this ever.

Would'nt this be related to an ad blocker of some sorts in your browsers?

No problems here. Are you running any extensions? Try disabling everything and see if the problem persists.

My first guess would be a browser extension is giving you these problems. Suspects in this case are adblockers or a Steamgifts addon (or any other addon that changes some stuff inside websites).

Are you using VPN or custom DNS? Easy way is to install Firefox and try using it to check if is browser related.

Chrome and Edge

that's the same browser basically, try FF and without any addons

endless processing loop

javascript failure, some blocking addon likely

I heard that 24H2 for Windows 11 created a whole lot of problems so maybe this is one of them. My friend reported to me that half of the older games he wants to play seem to not run under 24H2 and he had to go back to Windows 11 state before that upgrade.

I've got some weird behaviour in sites I used a lot. Here in SteamGifts sometimes appears the "Accept cookies" terms and it keeps appearing until I clean cookies/temp files for this site. So it might worth a try.

Sound's like extension?
Do u accept cookies, for SG-site?

If i had any money id bet this is an extension you use on every browser
And this bug doesnt mean its a malicious one (but could be)

Good news is that throuh the extension manager in settings (exists in every chromium browser, like edge and chrome) you can change how/when extensions works... sadly theres no blacklist of sites a extension wouldnt work, but you can set extensions to work on just some specific sites or only upon clicking on their icon.

Try SG with zero extensions. If it works start disabling one by one- disable one, reload SG, try, disable another one...

Theres also a rare chance its a bug by the interaction of 2 extensions, wich is way more headache to figure out wich ones. But testing browser with no extensions will give a hint if thats the problem at all.