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The audio you're appending..... where did it come from? Another video? If so, is the frame rate the same for each video? Although even if they are, there's no guarantee they'll sync. Sometimes video which appears the same is slightly different. One frame at the end of a scene less here, another there, and the audio appears to be wandering out of sync.
If you appended the audio and the second part is constantly out of sync (the audio sync doesn't change), then you'd possibly need to trim the audio or apply a delay etc to sync it, but it shouldn't go progressively further out of sync simply because you appended it. There's likely another reason for that happening.
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