I don't have an OneDrive account or something like that. I give you a concrete description (it's just a simplified and nonsense example to reproduce the problem):

1. Wanna buy a mushroom?
2. Leave. (end dialog)

-->Select 1: push

NPC: Oh yes! I love mushrooms!

--> 1. Here's a mushroom. (check: PartyHasItemTemplate > 0)
2. changeSubject (pop 1)

Now: All I do is always selecting changeSubject here, so going back to 'Wanna buy a mushroom?' and 'Leave'. And then I select 'Wanna buy a mushroom?' again and so on. As I said above: The node 'Wanna buy a mushroom?' appears as many times as mushrooms are in my party inventory. And after that there's just 'changeSubject', so I have to restart the dialog, and the same thing happens again.

My mods for DOS 1 EE: FasterAnimations - QuietDay - Samaritan