To reinforce on moman21’s post, I would say there definitely is a random aspect when it comes to the fingerprint requests. The most common reason is that your name and/or DOB is similar to someone who might have criminal records and/or prohibitions, but sometimes people get the fingerprint request I think just by random selection. I’ve been living in Canada since I was a minor, never travelled continuously for more than a week, have a combination of first, middle and last name that probably only 2 people on the planet have, never even got a parking ticket in my life but still got a fingerprint request.
bottom line, don’t be alarmed if you got a fingerprint request and someone else did not.