Steps to recreate:
[LIST=1]
[*]File->New
[*]Quest->Misc Data->Bottle Shop Types
[*]Click 'Edit'
[*]lclick red potion icon
[*]rclick red potion (combo #5120)
[*]Observe combo #5253 is selected
[/LIST]
Wrong combo selected on right click (Bottle Shop Types)
The Bottle Shop Types window is created by onBottleShopTypes() in zquest.cpp
Cannot reproduce this by right-clicking the combo list, selecting "Open Combo Page" and proceeding from step 5.
The Select Combo window is created by draw_combo_list_window() in zq_tiles.cpp