Retail version of the game had that error in the item stats, it was later fixed in the update, if that bug is present in the Spinxas's version of the game, that means he/she might not have the latest version of the game for some reason, if the parameters are not the ones like in the image below, then the game is non-updated version.
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Blame Locale Emulator for that, it causes some hijinks to happen with the Dieselmine's rpgmaker ACE games, change your locale for Japanese for real and those lags stop.