There have been several different sound mixes for that film over the years, so, it is not a surprise that the sound levels for each element–music, dialogue, spaceship fxs, creature fxs, etc–would be different in balance for each sound mix.

As far as what you can do about it? You can replace the audio for that scene with the one you like, but you may have to do some research on your own. There are a few free audio editing softwares out there. Perhaps doing a personal project like this will help you learn how to use these softwares.