Is this an emulation problem or are the online copies corrupted? You can buy an original copy of the game on eBay and run it in Dosbox-X or Dosbox-staging, both

Is this an emulation problem or are the online copies corrupted? You can buy an original copy of the game on eBay and run it in Dosbox-X or Dosbox-staging, both well ahead vanilla Dosbox in features. Also, I bet the Internet archive or exoDOS will have a perfect copy. The latter is a one click experience. Check the laws in your country for whether these are legal.