Online photos glitched while using iMac
I own and operate 10+ iMacs between the office and home, most of them under 5 years old. All of them are running the latest operating system. On occasion I'll surf a website that has photo slideshows, for example car sales or real estate. The photos in the sliders will random glitch out and nothing clears it. No restart of the iMac, etc. And it seems to only happen on embedded sliders, not pop-outs and it happens at the home and across town at the office. Any ideas? Is this a Mac thing or a faulty slider thing? See below.