Cache uses https

I have a http site that uses the non prem version of this plugin.

About a month back I suddenly noticed the site was half down. Upon inspection I found that all the images were being served as https, so none of them were showing. Also it triggered my anti virus into blocking the site as having a non-valid certificate. (cause it doesn’t have one, it’s a http site).

This is a commercial website so I was freeking out a bit but I quickly found that loggin in and clear cache -> delete cache solved the problem.

I’ve been kinda busy and forgot about this but then it happened again this morning and I again quickly fixed it by deleting cache.

So, I don’t know what causes it and I can’t retrace it because I deleted it. I don’t know what triggers it or when it happens and I don’t really know what it does besides serving the images as https instead of http. I don’t even know if it’s your plugin that is causing this. It does seem to happen shortly after a post was published.

Any ideas?