Nah, I don't set it to strict, and turned off the new Enhanced Tracking Prevention that's on by default. And all extensions were either disabled or set to permit everything on both sites. But I didn't reset my browser or start it in safe mode just to give a company my business.

It is totally possible that the "problem is on my side" but they still lost my business. There's only so much effort I'm willing to put into purchasing from a company if I can't use their website. Most places work fine, both of these didn't. I normally just find a company that has a better website to give my money to instead.