I’m not exactly sure what that could be, but I do know the Aspire theme itself wouldn’t cause that to happen. It’s definitely something external causing this.
If I had to guess, the only thing I can of is maybe you have a Plugin active that displays a Mobile Version of your site when viewed on mobile devices? If that’s the case, then it could be set to display this version when viewing through https.
Other than that I’m not sure what it could be since it’s never happened on my end. Maybe try reaching out to your hosting company to see if a source pops up for them?
Let me know if any of that helps or if you find out what was causing it to happen.