It looks like you subscribed to the product "Yamaha PRO 500" which that thread is tagged with, so since that thread talks about that headphone (as it's been tagged as such), you're getting it in your subscriptions.
@Frankzappa92 - As you can see here in the For Sale and Trade Forums FAQ, you must be a member of Head-Fi for over thirty days, and you must have over fifteen posts on Head-Fi's forums in order to post in the FS/T forum area. Please note that when you do reach the necessary post count, the change isn't instantaneous. The system checks periodically to see who has reached the necessary level to create a thread in the For Sale and Trade forums.
@Blueshound24 - Can you try clearing your cookies and cache again? I know there was an update recently that helped some users who were having login issues, and to make sure that older cookies are not around to cause an issue, you'd have to clear them again. Please let me know if you are still having issues.
Thanks for reporting your issue.... What version of iOS are you using and which browser and browser version are you using? I know Chrome for iOS seems to have some issues retaining cookies between session, I can still log in without issue.