acymailing filter plugin (solved)

Since we upgraded to Hika 2.1 ( and now 2.2) and Acymailing 4.2 our filters are not working as expected.

We had setup a filter to add people to a list when their status became confirmed for product X. That worked but now I saw it doesn't anymore and I must assume it was because of the updates.

We have 12 confirmed orders for the product, when I make a manual filter for 'confirmed' orders, it sees only 7 and just 5 of them ended on the acylist.

Anything I can do to debug why this is happening?

Problem solved: webmaster switched off registration during checkout so no users were created and Acy can only work with 'users'.