Background images on client and host systems change

IHARTBOX

I only use this software to assist parents from time to time.  When I accessed their desktop the first time from laptop, MY background image became theirs.  When I changed theirs back to what it was prior to connecting, physically at their system, the background image on my laptop then changed to match theirs.  I have only connected twice to their system.  But every time I change the background image on one system, the other system automatically changes to match!  Neither system as the other’s image on their system.  The only connection is teamviewer.  Please help!

TheJltres

I also tried to uninstall on both sides, and nothing...

TheJltres

Hello @IHARTBOX 
I have realized where the fault is in more depth.
I have reinstalled Windows this weekend, and the background did not come out, it was when I signed in with the Microsoft Windows account.
I connected the microsoft account to windows and the wallpaper changed.

TheJltres

Fixed @IHARTBOX 

Windows updates...

https://www.groovypost.com/howto/stop-windows-10-syncing-themes-between-pcs/