Does it fluctuate only when you change the sort or does it fluctuate when you are just refreshing? There are some sort categories that will not show all your items because they currently don't have a label for that category. Timeline should always show all your items (as long as you are not over the display limit that is listed at the top).

The sticker is from fighting a challenger. Did you recently have a battle?

If you create a ticket, a UA can look into your logs and see where the items came from.

I see this was resolved via ticket so I am going to lock this up.