could be broken. or you're bad at judging angles...
shimano SPD: ±4° float, spring loaded self centering.
TIME ATAC: ±5° and 5mm lateral
crank brothers: ±5° float, unrestricted for first 5°, Spring self centering after 5°
bebops: 20° float, unrestricted (-5° heel in, +15° heel out)
look quartz: ±3° Angular Float, ±1.5mm Lateral float
after those angles are reached, the cleat will pop off the pedal.