Strange behaviour with ListView and separator thickness on iOS 8

Hi,

I've encountered a strange bug with the ListView, please see attached screenshot. Some of the separators is thicker than the others, and when I scroll it flickers a lot and changes thickness randomly.

This is on iOS 8, and I've tested on latest Xamarin.Forms 1.4.3.6356-pre1 but also Xamarin.Forms 1.4.2.6355.

Have anyone encountered this and know what could be wrong?

Thanks!