If you want to fix it with some sort of Magix feature, one way that sometimes works is to go to the System tab in the Program Settings and unclick the Internal Import for whatever audio type that's giving you trouble; I think Magix will then open the file however your computer normally does [probably using your own computers audio codecs... not the ones built into Magix]
... but I usually just convert everything to WAV, then import. Works every time.

