Visits * Conversion

Do you have anything else happening in your table or panel? Any Segments that might be causing some minor issues? Are you running this on a Virtual Report suite that might be using a segment that is causing a discrepancy?

When I do this in my data, it lines up exactly. If you can't show your data here publicly, would you be able to share a small sample directly with me in private messaging? So I can see your setup and maybe be able to spot something that I can't from your description?

A discrepancy as small as .2% (either positive or negative) sounds like it might be a rounding error. When you multiply visits by conversions you could end up with a number that isn't a whole number (ex, 10 visits and a conversion of 23% would equal 2.3 orders). But in actual data, you can't have a partial order, either someone places an order or they don't, so something like 2.3 orders wouldn't be possible, it would have to be 2 orders or 3 orders. When you get into big numbers and multiple different time periods, it becomes more possible that if your rounding numbers there will be a slight discrepancy between an estimate and an actual number.