I can reproduce the issue on my iPad (safari). On a pc with chrome oder mozilla the redirect goes directly from my site to the hundeland.de site.... You do not see the affiliate links "between". So I do not know if there is the issue, too.
Using safari browser on ipad or on iphone you can see all the redirects with the affiliate links "between" my site and the merchant site.
Could you try it with safari on a ipad to reproduce the issue?
I think the issue just appears with the hundeland.de merchant.... Couldn't reproduce it with others, yet.