I noticed something similar when this was posted before, but after refreshing the page a bunch of times and noting how long the resources took in Chrome Inspect

I noticed something similar when this was posted before, but after refreshing the page a bunch of times and noting how long the resources took in Chrome Inspector, it looks to me like the CDN just occasionally takes a really long time (like, several seconds) to serve one or two images, which can easily throw the results one way or the other if it happens.