Differences between HTTP and HTTPs

  • I recently started noticing a weird issue, where when I logged into my perch site, currently in development.

    The issue is that it was showing different content than I expect, if you see the image bellow, the Pages on the right are the correct ones.

    At first I thought this was an issue with Firefox and then I found that the issue is that it seems to think that HTTP and HTTPs are 2 seperate sites!

    I don't know how I have ended up with this but I'd like to fix this issue before it goes live. Live website is on a different domain name but it works fine.

    Anyone have any ideas?