If you present as something unexpected (more educated, different social class, different age range, etc.) to someone hiring, they are often going to try and figure you out.
I bought a bicycle and got a day job doing credit card collections for a bank.
That was my 'big break'; I still work for a bank, but now I write the software. I worked my way up.
One afternoon I was talking to someone from human resources, and she mentioned that they didn't want to hire me for that job, back when I was 25. Why? Because I'd scored so high on the entrance exam. Basically they thought it was pointless to hire me because I was overqualified. Yet I was homeless at the time, having been evicted from my condo!
Whether or not the OP was strategic about this I have no idea. Sometimes people are turned down just because they give the impression of being overqualified, or because omitting that experience leaves too many gaps.