First of all, right now you are not seeding anything. You can check this by going to your torrent stats here
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. As you can see nothing is in seeding and all your torrents are shown as inactive. If you are seeding but the tracker doesn't show them, that means there is a misconfiguration on your torrent client and the VPN.
As far as VPN goes in general, there is no issue (other than bad configuration) from our side and in fact, we allow VPN for torrenting as we know some countries don't allow it. It will only affect you as your speed, in general, will be slower but it's a small price to pay since it's forbidden by your ISP.
When you are seeding and everything is back to normal, look again on the same page. You will see that older torrents have zero at the leech column (red arrow) which means no one is currently requesting that torrent and that's why you don't get traffic. To counter this we offer seed bonus points. You get 1 point for roughly every 90 min of seeding a torrent and when you have enough points, you can exchange them for upload GBs. More info here.
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We all need to remember that seeding doesn't always mean uploading. Seeding means your client is ready to upload when requested after completing the download (leech) of a torrent. Whether or not you have traffic on a torrent depends on the time and popularity of a torrent. Some torrents get more requests than others.
Hope it helped.