It's weird, I changed it back to double-check, and was sometimes it was saying it wasn't secure, and sometimes it was--even on the same product page. I'm not sure why. I can understand if it went from showing that it wasn't secure to be showing that it was, due to caching, but sometimes it was the other way.
What issues came up when it was https? I'm tempted to keep it as https, depending on what the issues were that you heard of.