A bit weird if you ask me. I did some digging and only three qbs taken in the second round of the last 3 drafts.
Osweiler-2012
Kaepernick and daulton-2011
None in 2010
Go back three more and i think it's only four but of those four I think only chad henne still plays. Percentage wise you would be correct but the sample size is pretty small.