I happened to notice that when you save a liturgy, LSB 2 will allow spaces at the end of a name. For example, if you want overwrite a litrugy that you have created and you click on 'save as', you need to make sure you erase the space between the liturgy name and (modified) or else you will generate a new liturgy.
Say you start with "DS 1 Comm (modified)"
"DS 1 Comm " will create a different liturgy from "DS 1 Comm" (note the difference in ending space"
I think I remember the same issue back with LSB 1. It's not a major issue, but the problem is that in the Custom Liturgy list, you end up with two services that appear to have the exact same name, since the final space is invisible.