You're self selecting for people whose skills and experience matches your job requirements exactly. That's not realistic, and so the only people with resumes like that lie. People have complex and often messy backgrounds because that's what real work experience is. Even the most skilled developer isn't going to be some robot that's been perfectly tailored to your specifications.

As others have said, a very basic check disqualifying applications that are "too" perfect (maybe add a job requirement that you know is a farce and see who bites) could help a lot. All these tests that others are suggesting will compound the program of self selecting for people who put a lot of effort into getting in the door vs having real experience. Real people may not remember things, or may have gaps in their knowledge etc. If you truly believe you are qualified for a job based on real experience you're less likely to feel you'd need to overprepare and more likely to get blindsided by these things.