Masters-verticals not interpolating

So I’m finally trying to work with multiple masters. I have set up a bold and light weight, with a “regular” weight instance. Everything looks good except my vertical widths aren’t interpolating. See this screen shot of my H:

Any ideas what the fix is?

What do you see if you select the regular style in the preview? Instance Selection.

Update: So it turns out when you “Generate Instances”, it outputs fine. The “Show Preview Offset” function doesn’t match what the interpolated final product is. Weird. Maybe something to fix there.

Preview looks good.

The “Show Offset Preview” has a totally different purpose. It has nothing to do with instances.

Thx. I think I’m back on track.