The Circular Dilemma of Section 62

Mainly, I'm still trying to wrap my head around Section 62 of the Contract Act. It says, "Where, in a contract, a party has promised to do something in a particular manner, and the promisor omits to comply therewith, the promisee is entitled to claim compensation for any damage which he suffers by such non-compliance." But the problem arises when you consider Section 65, which states that even if a thing is done in a manner that deviates from the agreed upon manner (but not significantly), "no damage" can be claimed. What does "non-significant deviation" even mean? It's like they're saying "do it however you want, as long as it's close enough". I'm starting to think it's not just me who's confused about this, right?