Retirement tax questions

Thanks, I understand that a portion of the SS is taxable.  What I do not understand is why the 2 worksheets arrive at a different amount of the SS that is taxable.  The jSSBenefits Worksheet for 1040 Line 5 calculates the taxable amount at let's say 8000.  However, the SS Recipeints Who Contribute to a Traditional IRA Worksheet PAGE 1 calculates the taxable SS amount at 11,000.  That makes no sense to me as it results in a lower allowable IRA contribution which was not reflected nor calculated until I complete the State tax section.  Then, all of a sudden the calculation changed dramatically.  Since it did not recalculate until the 3rd time I had gone thru the taxes, it makes me suspect that it IS calculating correctly.  Also the SS Benefits Worksheet does not have any of the detail  on lines 2 thru 19 completed on said worksheet - just line 1 & 20.  I recalculated it using excel to confirm that figure.  Again, thank you for your assistance  🙂