articles showing "0" in the end when selecting archives

Hi there,

I was searching for my problem here, but couldn’t find something that would help.
When I choose a month in the archive all the articles have a “0” at the end, check https://drahtseilakt.com/sand/?m=201203 for example.
I was looking through the code over and over again, but actually I have no idea where to search. I’m using a the apricot theme and modified it for my needs.

any ideas?

thanks a lot!