Trouble with Membership 2 - expiring memberships that haven't expired!

Hi There,

I'm having problems with the Membership2 plugin. We have a client (KatyRatican), who has an expiry date of 12th May 2017. This has already expired.

We've checked the server time and we have noticed that it is before this date. We haven't manually expired this account either.

Could you please help? Thanks.