i was walking and i twisted my knee cap, it quickly snapped back into place but its been feeling pretty off. is there something wrong with it?

yes there is.

Explanation:

it could indicate the breaks (fracture) of the kneecap, lower portion of the femur, or upper part of the tibia or fibula. Knee fractures are most commonly caused by abnormal force, such as a falling on the knee, a severe twisting motion, severe force that bends the knee, or when the knee forcefully hits an object. Nerves or blood vessels may be pinched or damaged during the injury. The knee or lower leg may feel numb, weak, or cold; tingle; or look pale or blue.

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