BUG: Changing membership no cancel of other membership

Hey.

I have done several test.
Also with only MP2 activated and a standard theme of WP.

1. If user change membership first time at the bottom at the pay site

You will pay EUR XX.XX for access until 10. February 2016.
When you complete this payment your Membership “Free” will be cancelled.

2. If user does not finish paying. Basic got the status "Pending".
So i press on it to complete payment.
Only You will pay EUR XX.XX for access until 10. February 2016. appears.
No cancel message. When user complet now paying. Old membership stay and don't cancel.

3. Same thing with Renew.
Only You will pay EUR XX.XX for access until 10. February 2016. appears.
No cancel message. When user complet now paying. Old membership stay and don't cancel.

Please fix this bug.

Thx