Left Ionic button not changing style on click on 90% of surface (but registering click)

I have strange problem with left button in header (and sub header).
When i click on it it executes test function but button style is not changed if I don’t click at right end of button.
If i move button to the right all is OK. It’s like first X pixels are not triggering style change.
I have image attached and right dots are clicks not producing style change. Blue once are where style changes properly.

With Regards,

Could you please add a sample codepen or a plunker link if possible?