When I play my audio with QuickTime or VLC it's all normal as soon as I import it into Magix Video Pro X, it becomes distorted as if slurring, how can I fix it, by the way, a few of the audio files are okay.
In the Program settings, Playback tab try increasing the size of the Multi track and Preview audio buffers - doubling them should be enough.
What is the difference in the audio files that play OK and those that don't?
If you are having audio issues on preview playback this would suggest you may have other potential issues waiting to be uncovered.
What is your computer specification and program version, see this topic for what is required and please quote processor and graphics card make/model in full.