System actions icons not displaying

[Nemeth]

Hi, one of my users has a strange case of system actions icons not displaying correctly. These icons are not custom, they are on the screen and clickable but there is no way to distinguish them.

This is a photo of her android tablet. The reassorting, sync and expandable buttons are not displaying correctly whereas the search icon is OK.

vs screenshot of what it should look like.

Another photo with another system icons that are not displaying well.

vs screenshot of what it should look like.

Is it a known issue ? How to fix this ?