There a lots of reasons a screw could be deformed from being removed other than being a cheap alloy. They could have added lock-tite or other thread adhesive.

There a lots of reasons a screw could be deformed from being removed other than being a cheap alloy. They could have added lock-tite or other thread adhesive. The person removing the screw used the wrong size bit or did not apply pressure perpendicular to head when applying torque allowing it jump out of the screw head (drive angle is important!!!) Similar to a wrong size bit, screw driver bits do wear out. A worn out screw driver will act like a wrong sized bit, and this wear is likely to happen faster if the tool is cheap.