is about solving problems. How many people do you see sharing a crossword puzzle or sudoku unless they're stuck? It's the nature of the beast to try fix it yourself, for several reasons
1) you don't know if you can do a task, or if you'll need help, until you start to tackle the problem hands on
2) you might not want to piss people off with stupid questions
3) you might feel you can tackle the problem on your own and let everyone else get on with their own job
4) it's a creative process, people work in ways which may not be compatible with other people's ways of working
Anyway, the people sampled for this study aren't likely engineers, but programmers.
There's a difference, engineers rarely get to write code.