I've noticed a couple of times now that some of my companions' approval levels aren't showing, as per the below screenshot (that shows the party view, but Lae'zel and Wyll's approval doesn't show when I look at their individual records either.

Prior to reconfiguring my party and taking this screenshot I'd had Astarion and Gale in my party, and Astarion's approval was showing but Gale's wasn't.

I've not played around further to find any patterns but I'll keep my eye on this as I go. Just wondering if anyone else has had the same issue.

I've had this happen to me a few times, with different characters, it seems to fix itself after zoning/loading. I haven't really tried to figure out exactly what makes it work right again.