Markup not appearing

I am working on a new site and can’t get the plugin to work. (I do have it working on another site, so I am familiar with how plugin should work).

I created a test attribute with two options — one no markup, one with markup.

I then created variable product and added this attributes to it. Generated all variations and set individual variation prices.

Looking at product page, i can select either option, but markup is not appearing. PHP error log is empty.

Anything else I may be missing?

Site is “under maintenance”, but if you let me know your e-mail, I can create login credentials for you.