I fixed the missing headings for each ability score. The change for the Notes tab was to make the text box have the text aligned to the left instead of the center.
I fixed the problem with THAC0 exceeding 20 when showing the to hit for negative AC. It's now properly clamped to 20 as the maximum for the roll needed.
Total weight was exceeding the three decimal places to show up to 8 places when there was only 3 decimal places being calculated.