Sage 100 contractor > bid item markup: bug!

In Sage 100 Contractor, Estimating module (9-5 screen), in the Bid Items window, "Overhead/Profit" columns don't always calculate. There's a workaround (delete the value, save, close out, enter new value, save). Is this a known bug? This is not the same as bid items losing the markup all together (which is a known bug).