Makes Prices on External Products disappear!

It took me a while but this plugin was making the prices of external products!
As the booking plugin wasn’t working for me (yet) I am currently using my products as external products so I can redirect to contact page for bookings.

I noticed that on all first products on a page the prices went missing? when looking at the backend in the list view prices didn’t show up as well but in the edit and quick edit prices do show. So first and the 1st, 13th, 25th etc product the prices disappeared (12 products per page) after setting it tot 6 products per page the 1st, 7th, 13th etc disappeared, so clearly its always the first product per page.
After disabling this plugin prices show normal again.. really strange!

Not using plugin because of missing dutch translation and my customer rather just wants the customers to contact them per contact form..