Fix logic for online web calculator

IN THE NEXT 48 HOURS can you fix the faulty logic on this website: <http://amfsolutions.com.au/floors+[login to view URL]>? that calulates tiling patterns. Example: enter 23m by 12m and select left-hand submit button. De-select 'staggered'. The 'cutting list' result is correct. But now re-select 'staggerred' and the new cutting list is different (which is good!) but not correct (not good!). A different type of error occurs if 23m by 12.3m is selected. Please fix this for all materials, loads, support lengths & widths. Thanks - Paul