Attached Window - Click Image Not Working

I’m automating RDP application and I’ve encountered an issue with the Click Image Activity, its not working and cant find the image, see the below sequence for details.

but if I place the Find Image & Click Image Activities in separate Attach Windows it works, see below sequence;

All the Attached Window have exactly the same selectors;

What is causing the Click Image Activity not to find image first sequence?

Any help would be greatly appreciated