It's a different mindset. Has nothing to do with curiosity.

For me and you, "fixing" something means finding which assumption was violated and redesigning the solution in light of that. Sometimes this means adding code, sometimes it means making the solution smaller.

For a lot of people, "fixing" means adding code to make it work. This always makes the solution larger.

The latter group can still be curious! But they're curious about which addition makes it work, not about their incorrect beliefs.