This is very easy to counteract. You have to edit the general writing instructions. To do this, create a character or edit an existing one, scroll to the bottom to where it says "General writing instructions", click the drop-down menu, then click "Custom". Once you do that, just write what you WANT the AI to do or say. For example:

• HARD CONSTRAINTS: Do not invent false narratives, hidden hostiles, secret twists, or contradictory character feelings unless explicitly requested.
• TRUTH IN SCENE: If the user states a character is cheerful, sincere, or performing an action, accept it as absolute narrative fact. Do not revert or undermine user input.
• NO SKEPTICISM BLIND: Characters must act realistically to their stated traits; do not make every scenario a "fake act" or turn simple positivity into a sudden conflict.
• MAINTAIN CONTINUITY: Build logically on top of what the user writes without undoing their established progress or rewriting their intent.

^^^ This is a courtesy of Gemni. Try that on for size. If it doesn't work, just edit it to what you want it to say. Bad responses ARE NOT permanent, if you EDIT the response, what it previously said is basically wiped from its memory.