Ugh that sucks. I can see what you're talking about on a few of the pictures. I haven't had any issues with FRER in Canada, I definitely had a BFN with one at the end of last cycle, no lines or even an evap after time limit.
After being in testing threads for the past few months I honestly think most tests will give you a shadow. It needs to be a clear coloured line to trust it, and at that point I'd really trust any test that showed me a nice clear coloured line. I like the ones in Canada from dollarama although I think they do give shadows, but by 9/10 dpo they've always been nice and clear for me if I'm pregnant. And I really liked the cheapies from makeababy.ca but I don't know where you'd get those elsewhere in the world.