Right now, Offerings keep getting sacrificed into runes, even if you can't afford any (complete) rune levelups.
As a result, Offerings keep dropping until whatever amount is gained per second.
This behavior occurs in both auto-sacrificing as in manual sacrificing.
It would be nice to see Offerings do not get sacrificed if no complete level of a rune/blessing/spirit can be gained.
synergism v4.1.10, but this is there since the first day i played (i guess v4.1.1 orso)