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As suneeshkachroo stated, both items I would look at. Ideally in a perfect scenario, yes First Launch, and visit 1 should be the same.
In cases where you are using some sort of potential custom visitor ID implemented, there could be a scenario where the initial First Launch and then after 'authenticating' that there is a new visitor causing a discrepancy. More investigation into exact implementation would need to be looked at.
As well a couple of additional items, if the user was potentially offline when the lifecycle hit occurred and the app is not offline enabled could be another reason.