Show all instances not showing italics on certain letters

Hello. My font has 10 instances where 5 are upright and 5 are italics. When trying to show all instances in my instance preview, the v, w, and y only shows the 5 upright instances but not the 5 italics. All my other glyphs are being shown with all 10 instances. Is might there be a mistake in my font regarding those 3 glyphs? Screenshots show the o as an example of how it should work, and then how there are only 5 instances shown for the v.


That means your outlines are not compatible.