forced https?

Hi there,
i updated wordpress 4.0 and woocommerce a few days ago and aftwards many things are broken.
So, my landing page doesnt load the css at all.
I dont get it what really happened.
All i see is that all the links are forced to open as https, but i dont have an https certificate.
I really dont know where to begin, maybe someone has an idea.
I have NOT forced https in woocommerce…

have a look at
http://www.filamentworld.de

if your going to a category and force NOT to open via https, everything looks normal:
http://www.filamentworld.de/produktkategorie/special-filament/hips/

Thank you in advnace,

regards
Robin