HTTPS even after disabling plugin

Hi,
I tried this plugin and it worked great.
But I decided I will stay on http for a while and after disabling – my site somehow still keeps opening with https.
I thought it was my mistake with manually changing all URLs to https [to get rid of mixed content warning] but even after getting my site reinstalled from backup (to make sure everything is as before) – it still keeps opening with https.
Can anyone help me with this matter?

The page I need help with: [log in to see the link]