[REPORTED] Wrong number of banners owned

Platform, device version and operating system:
Android 8.1, Lenovo TB-8704X

Screenshot or image:

What you were expecting to happen, and what actually happened:
I bought all 5 warbands, and now I have 68 banners in my collection: 34 from kingdoms + 29 from factions + 5 from warbands = 68. But in the lower right corner you can see “63/63 banners”. While team slots are shown correctly - I do have 41 of 46 available.

How often does this happen? When did it begin happening?
Maybe with adding warbands to the game.

Steps to make it happen again
Anyone can open this “Collection” popup and see that the maximum is 63: just kingdoms and factions, but no warbands.