Bug: Activity list, patron for how long???

In my activity list, I am a 5 month patron every month???
I have been a patron sins 20 Dec. 2017.

@supremebot

Weird, when I let my mouse on your Patron badge it shows that you are patron from 2017. Maybe you have changed the donation amount. But also in that case it should not do this imo.

Nothing have changed sins 2017 when a started donating, it must be a bug.