Variants Greyed Out - Customers cannot select variant when inventory is in stock!

I loaded two new products onto my site and when customers go to purchase, the variants automatically grey out and will not let anyone select a size, even though these are in stock. I cannot figure out what is going on! Can anyone help?

Of course. It is both of these:
https://shopbugandbird.com/products/reef-hybrid-shorts
https://shopbugandbird.com/products/alpine-hybrid-shorts

I have tried to remake templates, duplicate product pages to start over.. At one point I got it to work but there must be something funky going on.

Appreciate you tracking that down- What would I fix in global.js? I am not a coder.