URL paths in optimized CSS sometimes are https instead of http

The expanded URLs inside my optimized CSS files are sometimes getting generated with https instead of http. This appears to happen randomly. Doing a cache clear, recreates the optimized CSS and usually the URLS are correctly expanded using http.

The source CSS files have relative paths in them, for example:

@font-face {   font-family: "my-custom";   src: url("../fonts/my-custom/my-custom_47f454dc1e054575ab6c2a63cbc17e46.eot"); 

In the optimized CSS this gets expanded to a full URL:

@font-face { font-family: "my-custom"; font-style: normal; font-weight: normal; src: url("https://i.cdn.my.com/drp/.../assets/fonts/my-custom/my-custom_47f454dc1e054575ab6c2a63cbc17e46.eot?#iefix") format("embedded-opentype"),  

Then, seemly randonly it will be:

@font-face { font-family: "my-custom"; font-style: normal; font-weight: normal; src: url("https://i.cdn.my.com/drp/.../assets/fonts/my-custom/my-custom_47f454dc1e054575ab6c2a63cbc17e46.eot?#iefix") format("embedded-opentype"), 

I have CDN enabled on the site, so that might be a factor. But again why is the behavior seemingly random?

Any suggestions on where to start looking in settings, hooks that affect CSS optimization behavior, known bugs with CSS optimization, etc. would be appreciated.

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