Hi @doublezed2,
Thank you for your response.
In the meantime I detected the issue and found the solution, so I will leave it here for others that might face the same issue.
Facebook made a change on how they calculate Website purchases conversion value in ad account. Its now split into 4 parts, each having 4 options, by default it was on “total” instead of “value” which you need to select in order to see the accurate data.
Thanks again, hopefully it helps someone facing similar issues. Plugin works great!