There are so many browsers out there now I imagine programming the web site to fit every single one is a challenge.
When I used to do my site there were about three browsers. And keeping the site clean to handle those was a pain in the butt.
Most developers have tools that allow you to set minimums based on browser versions. You lose a lot of features if you try to code for everyone so they’ll typically choose the most used or program in adaptive style which in theory adapts to most browser conditions. I wonder if that was or is the issue.