After clicking 2 times (not counting the place click) the 3rd time the sieving progress gets to a negative number.
This as something to do with the type (byte) of progress: https://github.com/BloodyMods/ExNihiloCreatio/blob/1.12/src/main/java/exnihilocreatio/tiles/TileSieve.java#L48 ... Just change it to short ... or check if goes below 0.
45+45+45>127 ... RIP

Was discovered and fixed in the current dev branch.