BP Homerun Effect

In my 2015 season it says Mat Latos has allowed 0 out of 6 bp home run opportunities yet in 1 game he let up 3 ballpark homers and they were all off from his card. How is this calculated and is it accurate?

You know, Latos isn't that good anyway. Just cut him and the problem goes away.

Thanks to ScumbyJr for teaching me how to find the ballpark effect stats!!! Very helpful--and pretty much as I'd guessed. In general, looks like ballpark effect is much greater for HR's than for singles.

steve