Are you serious??? What a strange behavior... Quite unusual.
So, probably I included a blazing xtremely fast speeds on my MAX transfer!

Don't actually remember which tool I have used...
BTW, is there a way to test the MAX TRANSFER SPEED maximum value before writing the partition information and formating? That's because if I miss, I would need to erase and write everything again, over and over, just to try to find the best value??