Two MKV files from one BD disc?

[sanji99]

Apologies if this problem has already been posted but I couldn't find it.

I am ripping some home-authored BDs for backup, and some movies are resulting in two MKV files. The BD discs in questions have a preliminary menu with 'cars' or 'eat', for example, that lead to separate 'movies' about track day or the subsequent dinner party.

Is MKV creating a separate image for each?

And how can I burn both to a single BD disc or image that will play as designed?

I created the BD discs using Pinnacle Studio and they play fine in my Sony BD player.

Thanks in advance.

[Woodstock]

By default, MakeMKV will make a separate MKV file for each play list, or each transport stream file if there is no play list. Menus do not matter.