Discovered a nifty issue. Did a quick search and didn't see anything about it, but sorry if this is already covered here.
Searching for “5 cent” with quotations on a PC gives me proper results.
Doing the same on iPadOS and iOS doesn't work.
It's “Smart Punctuation” in iOS, which apparently uses the curly quotes instead of straight.
You can tell by the URL.
PC - https://en.numista.com/catalogue/index.php?e=canada&r=%225+cent%22
iOS - https://en.numista.com/catalogue/index.php?e=canada&r=%E2%80%9C5+cent%E2%80%9D
%22 being standard quote
%E2%80%9C unicode open quote
%E2%80%9C unicode close quote
Apple would refer to this as a “Feature” :) but I'll mark it as a bug since it wouldn't really change the site at all.