This is likely to be cause by the use of square brackets in the Items description. These need to be removed for the Print Bill routine to show correctly. (Normally happens in an imported file)
To Remove the square brackets:
Open Estimating
Select the Search Funnel
Select the Description Cell (Bottom right corner of search criteria window) and enter either [ or ]
Press OK to search and any items displayed will contain square brackets, these need to be replaced with rounded brackets or removed.
Once removed/replaced, rerun the Print Routine.