www.makemkv.com

You'll need to provide details of the disc in question to get a definitive answer. However possible reasons for multiple audio/subtitle tracks for a specific language include: Different sound formats (e.g. Dolby TrueHD, Dolby Digital, Dolby Surround); Director's/actors' commentary tracks; Alernate ...

I have seen the following topic and its subsequent topics:

https://forum.makemkv.com/forum/viewtopic.php?t=36758

But try and I might, I just want MakeMKV to set english as the default audio track while English and one other language are included (but not on by default) as subtitle tracks with ...