Portrait displaying incorrectly

I know this is an insignificant thing, but it’s got me bugged.

I’m currently level 2821, but my frame shows 2721.
Now… we’ve all seen missing stars. In this case it’s a different frame showing in relation to my current level.
From what I was told, level progression is read and then assigned the corresponding frame. So, why is it not working properly for me?

These were taken 8 seconds apart.

https://imgur.com/Vdb4F0R

https://imgur.com/rWoEuma