MRTK Hololens Tooltip Problem

Hi everyone,

first of all I'm pretty much a complete beginner in unity and vr/xr development so I hope I can find some help here.
I am on a very simple project for the hololens and for that I use the mixed reality toolkit.
So my problem: I have six cubes arranged in a sphere object collection (from the mrtk).
So when I add tooltips (the tooltipspawner of the mrtk) directly to the cubes the tooltips are completely distorted.
When I add the tooltips outside of the object collection the tooltips behaves as they are supposed to.
When I add a parent empty object to a cube object and I add the tooltip to this parent object I get a good looking tooltip but then the sphere object collection recognizes it as an empty object.

Does anyone understands my problem and have a solution for it?

best

 

This might be hilarious but if you add sphere collider on any object it gets fine.
Lost around 12 hours to understand that problem.