Digistore24 promoclicks lost

Hi there
I just started running Digistore24 with 3 of my twitter accounts, recenttly I found a wired issue

I use my own url shortten website, for one product usually I receive 20 clicks to my shortten website, I check this from my dashboard
But on Digistore24 it only received 2-3 clicks

Do you have any clue what would be the cause?

I also tried other shortten service like Bitly, but no difference

Thanks in advance