Library sort by rating seems not to be fair

It looks like if the sort by rating shows the oldest entries first. I’ve created 2/3 of the German lessons and my first lesson is on page 3.
http://www.lingq.com/learn/de/store/search/?search=&category=&type=&level=&accent=&provider=&sort=rating

I see that this is indeed the case. We’ll see what we can do here.