The movement may be part of the ignition and safety sequence for that burner. Use the model's procedure rather than treating resistance as a stiff ordinary knob.
What the observation means
Pushing, holding and release instructions vary. A control that behaves differently from before still needs assessment, but force can damage it. Electrical oven controls on the same cooker may operate differently.
A useful next step
Follow only the documented lighting sequence. If ignition fails or a flame will not remain established, stop and follow the manual's waiting guidance. If gas is smelled, stop troubleshooting and contact the gas emergency service from a safe place.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.