Subscriber not being added after payment

I’ve been using Leaky Paywall for a year or so with no issues. But suddenly new subscribers have stopped being added when they pay for a subscription. The payment goes through PayPal just fine, and their user account is created just fine, but they’re not being added to the Leaky Paywall subscriber list. I am having to manually add them as paid subscribers.

I did make some changes to the website but I cannot pinpoint anything that would have caused a change. I did install the Ultimate Member plugin to see if it would work with Leaky Paywall, but I’ve since deleted it.

Any ideas??

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