I tried the filename “Wolves of Ardeal.wav” and it worked as it should for me. So I wasnt able to recreate that.
You could try to clear any xml chunk tags in your wavs, in case you are using broadcast WAV that have tags. Not sure if that can be an issue. I was able to rule it out as an issue in my tests, but it might be worth a try. You could also post your wav that is causing issues, and I can take a closer look at it.
You could also try importing the wavs from a different folder or hard drive (just to rule out any “external factors”).