Strange Discount Being Applied to Membership Option

Hi all,

I love the Membership 2 plugin and it's going well. A user has seen a bug (or unexpected situation), and I'm not sure why it's occurring. I'm hoping maybe you have some insight.

Her one year membership has expired, and when she signs in she can see two options for continuing her membership: one month for $10 or one year for $99.

Here is what she sees: https://www.dropbox.com/s/1jsq7xf1i8w1zek/Screenshot%202017-05-21%2010.01.33.png?dl=0

But when she selects the one month option, it applies a $10 discount for some strange reason (bug?):
https://www.dropbox.com/s/s55gby1dozf6zzo/Screenshot%202017-05-21%2009.46.36.png?dl=0

Her only active membership is the one highlighted, which properly allows the monthly or yearly renewal option: https://www.dropbox.com/s/b2pkxikzvt0m0zn/Screenshot%202017-05-21%2009.51.16.png?dl=0

If she selects the Yearly option, no discount is applied (as expected).

Any idea what's going on here?

Thanks for your help!

Best,
Michael