I'm having this problem on an increasing number of web sites; I suspect that web page building tools are becoming more and more hostile toward any browsers except for the anointed few (Edge and Chrome, plus Safari for the Mac folks).
I once had a W7P machine which helped me check such matters, but hardware failures on my ancient machines necessitated that I wipe W7P and install Debian. I need to replace that box. I finally got hold of a support tech at RTA in Smithville, and found that www.chewy.com displays properly on a Windows machine at their Smithville office. RLH
