Invoice issues in Membership

I am using membership 2 plugin and I am getting multiple invoices from a membership
like tons of invoices. The expiry dates have also changed.
This is on the invoice:
Invoice date 19th August 2017
Status Paid
Name SPNL Annual Membership
Description You will pay GBP 35.00 for access until 19th August 2018.
Amount GBP 35.00
Payment due 15th December 2072 - Please note this date
Total
GBP 35.00