Unfortunately rebuilding the data didn't change anything. Thank you for the idea - never hurts to try.

One other thing I noticed about the "Actual Item Cost Detail" report is that the dollar amount listed under the 1 hour entry is 4.75% of the amount listed above it for the "real" hours worked. So in the screenshot below, the $19.56 amount is 4.75% of $411.71. Same with the numbers near the bottom: $10.67 is 4.75% of $224.57. This is true on all the "Actual Item Cost Detail" reports. Every amount next to the 1 hour is exactly 4.75% of the amount above it.

I'm wondering if that 1 hour cost amount has something to do with taxes or some other type of deduction?

I opened the paycheck details and didn't see any deductions in those amounts though. One of our employees gets reimbursed for mileage but the others don't. This mystery 1 hour appears for all of them.

That's as far as I've gotten.