There seems to be a problem with the "recent stockpile +/-" column of the minerals tab of the F2 screen not properly taking incoming mass driver packets properly. I think this is similar to the timing issue that you fixed in the wealth change a few months back - i.e. that the times were set up so that income received during the turn is ignored.
My mercassium has been showing "-1" for a while, even though I've got civie mining complexs throwing a lot at my homeworld, my homeworld is barely using any, and the total seems to be going up

I finally sat down and tracked it day-by-day during a 5-day. Here are the total and delta columns:
start:1867/-1
day 3:1872/+4 (caught +5 packet)
day 4: 1877/+9 (caught +5 packet)
day 5: 1876/-1 (consumed 1 from shipbuilding)
So it looks like the delta column is being calculated from just before the update being performed, rather than from just after the previous update. Whatever timestamps you're using to fix the wealth delta calculation should fix this one too.
John