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The difference here is that, when you look at the rulebook, some maneuvers are described as using "a standard action" and others are "in place of a melee attack", ie. an attack action.
When you normally attack with a weapon, and let's say you have 3 attacks, that's 3 attack actions you can use with a full round action. Or, 3 combat maneuvers you can make where the text for that maneuver says "in place of a melee attack".
If it's a standard action, like grapple, it's not really an attack at all - invalidating your regular 3 attacks that you could otherwise have used. You'd only be able to use it once, because you only get one standard action in a round.