Paypal transactions not showing up or including name


I'm using the Membership Premium plugin on a site together with the PayPal Single Payments Gateway.

Payments are being processed correctly, however, when I go to 'view transactions' I'm only seeing 3 transactions total, while we've had over 50.

Also, in the Paypal backend, the person's name is no longer being shown on the transaction. It was for previous membership transactions in January last month, but doesn't appear to be showing recently.

FYI, this website was on an old version of WP and the plugin, but I have since updated both to the most recent version. I'm not sure if that fixed the issue since there haven't been any new transactions since.