My Website isn't working properly on firefox

I’ve noticed a strange problem in Firefox where some images on a website don’t always load the first time. The page itself loads normally, but occasionally a few product images are just blank. Refreshing the page usually makes them appear. I’ve been noticing this while working on a site I maintain, for example on some of the product pages here https://emcindustrial.com What’s odd is that I can’t seem to reproduce it consistently. The same pages work normally in Chrome and Edge, and sometimes Firefox loads everything perfectly too. I’ve already tried clearing the cache and checking with extensions disabled, but I’m still seeing it occasionally. Does anyone have any idea what could cause Firefox to load the page but fail to load individual images? Is there something specific I should check in the Network or Console tools when it happens? 1st image is what's showing on firefox, 2nd is how it should be ( showing on chrome)