Running App on two devices

I use my CLZ app on my phone and my tablet (both Android), and sync religiously. But I get a different number of series showing up on the two devices, and when I check top writers, I see that the count of issues on my top writer differs as well.

I’ve got over 52,000 comics logged, and over 7500 series, so it is essentially impossible for me to figure out which books are included in one versus the other. What’s the deal?