Place Active Cell: Cell mirrors unexpectedly

Hi all,

Here's what happens

I activate the Place Cell tool and select Interactive: Rotate Only. I'm asked to enter a cell origin.
I place a data point to place the cell. It shows up on the datapoint. Next I'm asked to enter rotation by angle or point.
I select Perpendicular Snap and snap to a line.
And suddenly the Cell gets flipped into a mirrored image hanging upside down from my datapoint. I actually have to check the Mirror label in the dialog to flip this back.

This happens when perpendicular snapping to Lines, Linestrings, Multilines. But Arcs, Shapes and Complex Shapes do not have this weird effect. Also I tested wether the line direction had any influence, which it did not.

Does anybody know how to get rid of this?