🚀 go-pugleaf

Hello Kathryn,
I think the problem lies in the syntax you're using for your Index entry In your example:

Text in index marker:
PBX:design;switch:design;design:PBX switch);

This will produce four index entries
Symbol
2-19
D
design
  PBX (switch) 2-19
P
PBX
  design 2-19
S
switch
  design 2-19

The symbol entry comes, I think, from the last semicolon in your index marker string.

If your expected results are:
P
PBX
  design 2-19
  design
    PBX (switch) 2-19
  switch
    design 2-19

Then your Index marker string needs to be:
PBX:design;PBX:design:PBX (switch);PBX:switch:design

NOTE there is no final semicolon.

I leave it to you which Index marker string you prefer; the first giving entries in D, P, and S; the second giving three subentries under P. My own opinion is that the first string might be more useful to your readers. Whichever you choose, miss out the last semicolon.
Hope this works for you.
Cheers
Ian