I’ve noticed the same issue. It seems to be happening on a lot of random stores. I’ve made a webpagetest of couple of them. Notice the weirdness of first ~4 requests.
I’ve compared the CDN links to https://steinmart.com/ and they match so it looks like somehow the requests bleed to other stores from that one store? Possibly some issue with the new rendering engine / online store 2.0 updates?
Also a disclaimer: it’s not a theme issue, the assets do not exist on any of those stores but they do exist on https://steinmart.com/.
Edit:
I hope it’s fixed soon as it’s a bit of performance issue for all the affected stores.
If you have control of the preload itself, meaning that it is not being generated by a third-party (ie: an app) then you will need to prepend a stylesheet to the rel attribute of the tag.
For example, the following sample would silence that warning in Chrome’s inspector: