Counts of unique cards is different present in overview screen vs collection screen for a given pack.
PFA
Can you share the overview filters?
Just filtered the collection for ‘Extradimensional crisis’ expansion pack. Rest all are defaults. At the top it shows the unique and the total counts of the pack. In collection page, it shows 20 which is same as what I have in PTCGP app but in the Overview page is showing 21 unique cards which is not correct.