You are right and I have no idea how I came to 1,51 ;)
So lets say that you have approximately ~0.5 pops per training in OD (2 position, level 5 coach, 18 years old). That would mean... I'll be back here in this thread on Friday if either the one player pops again or my players wont pop ;) . But it seems still very strange for me to not have any single pop in the last 3 weeks.