Yeah you are right... Personnaly, I never get to that site. I dumped my games with Cios Iso dumper 1.2 by Waninkoko (damn old software) The process is SLOW. But, this makes me think the game is fully copied byte-per-byte, meaning a clean 1:1 ISO. Once done, I fully test it on my Wii, then I keep the file safely. My previous case with Spyro was different, I got the game from my sister recently, a used but not scrtched one, I didn't want to wait long, so I gave a go on Cleanrip... The problem? Two dumps, none worked on nintendont, even if the game worked perfectly on dolphin. Got back on the old software (glad my old wii still works) redumped the game in almost 2 hours... Guess what? It worked perfectly after the process
So for your problem, I suggest you to redump the game, even if all the hashes matches already