I think i now know what happened: Firaxis has made some changes in their tech research calculations. For instance when you put science slider > 0%, you get only 1 beaker/turn. How higher you put the slider, how more extra beakers you get.
But in my case i think the problem was i could research Priesthood in 1 turn, getting overflow beakers from Meditation ( the tech i researched before). Cause it seems that from researching (in my case) Priesthood i get less extra beakers than i got from Priesthood, the difference was fixed, but 1 turn to late, so it's (again) a case of misinformation.