Why won't the drill bit remove the screw?

I know this may be hard to troubleshoot online but

***The screw is NOT stripped.
***The drill and drill bit DO go together.
***100% sure the drill is not in reverse

When I go to remove the screw, the bit bounces off it, so I cannot remove the screw.
This happens even when j go as slowly as the drill allows.

The bit retracts into the drill and bounces off the screw...

What am I doing wrong?

I have probably near 100 screws that need to be removed and I will not do them all by hand

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Johnblackthorn · 56-60, M

Starting with the obvious is the drill trying to turn thr screw anticlockwise?

The bit should not ne able to retract,
Tighten the chuck to stop that happening.

Is it the correct bit, Phillips and pozidrive are not the same and there's 3 sizes.
a Phillips bit is marked PH 1,2 or 3
A Phillips screw has a plain x

A pozidrive bit is marked PZ 1 2or3
A pozidrive screw has an X but there is faint + as well.