Years back, I had that happen on PayPal of all websites. Their account creation and reset pages silently and automatically truncated my password to 16 chars or something before hashing, but the actual login page didn’t, so the password didn’t work at all unless I backspaced it to the character limit. I forgot how I even found that out but it was a very frustrating few hours.
That would be fine and dandy if most speed limits (in the US at least) were assigned intelligently and not just according to the 85th percentile, which just measures how fast people actually drive down the road, and assumes anything in the top 15% is unsafe and should therefore be illegal