Some ad blockers are very aggressive at blocking affiliate links. uBlock Origin blocks all track.webgains.com links and even closes the tab if there's a redirect, which is probably what is happening with the first link. I'm adding a feature that will call an ajax request first, and if it's blocked then I will simply redirect to an untracked link. Unfortunately I will lose potential commission this way, but at least the website will still work for everyone. It should hopefully work if you disable your adblocker.
As for the Metrofone link, it's just a redirect on their part. I did a curl request to check this:
> GET /pclick.php?p=29805977293&a=119158&m=6506 HTTP/1.1
> Host: www.awin1.com
> GET /basket/add/contract/iphone-12-5g-128gb-black/three-100gb-new-24-month-14.00/free-delivery?source=awin&awc=6506_1629914525_c508aa142e90213248adbdee4b995550&utm_source=[redacted]&utm_medium=AWIN&utm_campaign=[redacted] HTTP/2
> Host: www.metrofone.co.uk
> GET /contract-phone-deals/iphone-12-5g-128gb-black?basketRedirect=true HTTP/2
- some links automatically close after loading (e.g. the first link for the iPhone 12). Maybe the deal doesn't exist anymore?
- some sites seem to strip your affiliate id from the URL (e.g. the second link for the iPhone 12, metrofone.co.uk)