Page switches back to original language on checkout page

Hi,

thank you for the great plugin. By far the best I’ve used so far.
The only issue I’m still facing is that when checking out for a subscription on my english page it switches back to spanish.
If you go to: https://swingdancehome.com/en/my-courses/subscription/ and then click on “Get It Now” further down, you’ll see it brings you to https://swingdancehome.com/membership-account-2/membership-payment/?level=3 without the “/en/”.

What is the best way to troubleshoot or fix this?
This is a membership website using PaidMembershipsPro and Woocommerce for the checkout activities. Rather complex.

I’m using TranslatePress version 2.4.4.

Thanks for your help. Very much appreciated. ??

The page I need help with: [log in to see the link]