What versions of Unity and the Dialogue System are you using?
Are there any errors or warnings in the Console window? It's normal to see this warning after loading a game using the VN starter framework: "Dialogue System: Another conversation is already active". This is because the gameplay scene has a failsafe that tries to run the conversation again in case it isn't running for some reason, but when you've loaded a saved game a conversation it automatically resumes the conversation.
Im currently using the 2021.3.30f1 version of unity with the 2.2.47 version of Dialogue system
I do get that error you mentioned:
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As for changes, the only thing ive done so far is set up the build order for the three scenes (Start, Gameplay and Credits) and change the initial Database to Example dialogue.