[MEMBERSHIP] members expiring

I have a client who is using the Memberships 2 plugin and they have a couple members expiring and I can not figure out why.
Others are renewing fine and I checked and their credit card information in Stripe is still good. It seems it is a setting or something but I am not sure.
I have several that have seemed to have their memberships expire randomly and I do not know why.
It appears that the Stripe webhook is functioning correctly.