Trying to add total hours worked in current month

[Useless_w/_excel]

I'm trying to figure out what is wrong with this formula...

=(SUMIF(Q14:Q4995, "<="&EOMONTH(TODAY(),0),W14:W4995))-(SUMIF(Q14:Q4995, "<="&EOMONTH(TODAY(),-1)+1,W14:W4995))


I've got a cell that adds Total hours worked which pulls from the same column of entered data as the formula above and that cell works. My hours for the month however just shows up as zero. If I try and edit the formula or even just highlight it to copy it and then tab out of the cell this shows up...

1/0/00

If I undo the highlight and tab it will go back to showing zero. I've checked my dates that I entered and they are correct. I'm at a loss as to how to fix this formula.