Membership subscriptions not transferring from 2Checkout

I have had the membership plug in working on my site since January.I am using version 2.0.6. It has been working just fine, but the last two members who signed up did not have their subscription information added automatically to my members list by 2Checkout. I tried to add them manually and it will not add their subscription. I have to activate them manually and add their level, but I cannot add their subscription.

This was all done automatically in the past. I have not added any new plug ins.

I am using Business Portfolio child theme and WordPress has the latest update.

What should I do?