A significant difference between Taboola and Voluum clicks' amount

Hey folks!

I've been experiencing a difference between the number of visits (clicks on ads according to Voluum) that I can see on TB dash compared to Voluum. I can see on voluum reporting of way more visits compared to TB, like 30%-40% difference. the time zone is the same.
So I would like to get your help here in order to understand what could be the reason and which one of them I should look in order to do optimizations and get decisions base on that metric which ofc cause the LP CTR as well.

Your help would be much appreciated