Stop using the appliance and obtain appropriate gas help. An uncertain control position is not something to manage by guessing or forcing the knob.
What the observation means
The visible knob and internal valve are different parts. Removing the knob can make the indication less clear and does not repair the valve.
A useful next step
If gas is smelled, follow emergency guidance immediately. Do not grip the spindle with pliers, lubricate behind the panel or wedge the control in place. Describe the loss of reliable Off selection when requesting assistance.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.