Thank you Telluur.
"Something went wrong with your donation? Contact us here.
(select 'donation problem' and state at least the minecraft name & the account holder's name)" The blue usually links to "forums.slapgaming.com/sendmessage.php". Checking my address bar it seems that the redirect didn't change the address, seeing as it still remains as "slapgaming.com/donate"
I've cleared cookies and cache, changed nothing. I can't figure out why it would display as such, and the only way it properly redirects if I right-click; Open link in new tab.
Message I get from either redirect path is "invalid redirect url (slapgaming.buycraft.net)". Not sure what that means to you.