Sounds like a bug to me. I will check it out. For non-striped squads, the squad to hs reduction automatically reduces the cvp from 2 to 1. It may be an issue with all units that stripe.
Any fix would not be available until vasl6.6.3 releases this fall.
In the interim, after you have created the dead hs, you can use its right-click menu, select Reset CVP and then change 2 to 1. It's a bit clunky but it will work. You can even do this to units already in the casualties bin. Open the bin window by clicking the Casualties Button and then select the unit, etc.
Hit the Allied or Axis CVP button at the top of the cas bin window to force a recalc of cvp. Or better yet, back in the main toolbar window, hit the black-and-white cvp button (usually beside the MOV button) to see current cvp for both sides in the chat window.