QS Back ground color in variable highlights no assigned button

[Michiel_QV_Fan]

I have multiple buttons.

The background color is driven by this variable:

$(UDF_Button_BG(20303))

and that variable = 

If(OD_bin_del='1100O',ARGB(255,156,200,49),ARGB(255,227,227,227))

But, another button highlights with the same color but that has $(UDF_Button_BG(10303)).

I had a suspicion it might have to do with 10303 and 20303, being somewhat similar, but other buttons with the same stucture does not generated highlights.

Buttons are copied from each other.

However, creating a new button from scratch has the same highlight error.

I'm lost.

Any ideas?