bug with oven (fuel qualiy lost a digit?)

[DeadlyPencil]

There seems to be a bug with ovens that happens infrequently.

the oven formula is as follows:

outputq = (2*unbaked + ovenQ + Fuelq) /4

this was my input and the output

98 = (2*122 + 109 + 139) /4

you will notice the formula doesn't balance.

however the following formula does balance
98 = (2*122 + 109 + 39)/4

This is just assuming that it was the fuels fault. having a digit chopped off. the oven quality isn't changing. and it isn't possible for me to make unbaked goods below 100 quality with the stuff iam using.

there are no trees below 100 near me, it was not possible for me to grab the wrong branches. and i know i collected the right ones because i had 6 leftover branches and they are still quality 139 in the chest. This also happened last weekend as well, with no problems inbetween. This happened with ALL the ovens, (7) not just 1 of them. I logged out while they were cooking so i dont know if the server crashed between then. last week it was after a server crash that i had this issue (has happened once before but i assumed i did something wrong)

anyways, iam possitive my input values are correct. the output values however appears very wrong, and it seems odd how if you chop off a digit from my fuel i come out with the same result.