EDIT: Nevermind, turns out the new links are due to the offer only being in the US, and I'm in a different country. On another note though, what does this mean, it came in my email with the affiliate link;
"Please note that the s1 parameter should only be used to pass NON-UNIQUE SubAffiliate IDs. If you are using UNIQUE Click IDs each time someone clicks on the link, please use another Sub ID field (s2-s5) as instructed by your Account Manager. If you are using HitPath specifically, you can send unique Sub IDs and affiliate Sub IDs using the following method: &s1=xxagentidxx&s2=jjhitjj (For DT use &s1=%LINK&s2=%SUBID1)".
Someone please help me understand what this is about? Thanks! 
It means don't pass unique clicks IDs as the first available subid.
In your affiliate URLs you will have ...s1=something&s2=somethingelse&s3=etc
Don't pass unique IDs for postbacks/tracking after s1, do these after s2, 3, 4, or 5.
Because of the way many platforms prevent stats, passing a tonne of different values for s1 can cause problems.