Textbox flips mysteriusly over Y

[novski]

Hi
I'm considering a problem since a while now that i also already tried to formulate in a different post here in visguys forum.
So because i'm unable to understand what's happening, i made a test page that will show you the fail behavior.
I hope, some pro users can help me get rid of that, weird problem.
The blue line you will find in the Document has 3 Text Labels that follow the beginning and the end of the connector if i drag and drop it.
Mysteriusly the Text flips over Y some times without to show it in the cell FlipY.True.

Thanks for any help or recommendations.
Novski