Weird atlas mixup

Hi, some of our game users are reporting a weird bug.
For some of them, some textures get mixed up, and the game shows the wrong texture for some reason.
Specifically, it happens on this background texture. It’s a big independent texture, and it gets swapped for an atlas I’ve contructed for other smaller game assets.

This is how it’s supposed to look like (just focus on the background):
3484353--277233--ok.png

And this is how it’s looking for those users:

Some other users report that the background turns into solid color sometimes also.

What could be the casue for this behaviour? Specially, since I’ve never seen anything like this in our game, nor lots of other players that are not experiencing this issue.

Thanks in advance for your time!

up?