I can't sync .mkv file with the audio

I have a problem when I export my video. When it is shotcut everything is fine, but when I export, the .mkv file (OBS) doesn’t sync with the audio.
I have two kinds of files: .mts (from the camera), and .mkv (OBS)
I don’t have any problem with the .mts, but the .mkv doesn’t sync at all.
What can I do?

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