I looked at your spreadsheet and have the following questions.
Why is the date line 26 blank? If you wish to keep blank lines then your formulas need to trap anticipated errors due to missing data. This will avoid the #DIV/0! and #NUM! errors.
Why are cells AI6 and AI7 using vk4 vs vk9 as the rest of the cells in the AI column?
Column AK is trying to calculate a rolling 6 sigma level. Rejects are not a normal function since it is lower bounded by zero. Also, there are no specifications for rejects, therefore, no Cpk or 6 sigma level can be calculated. Therefore, column AK is not providing any information of value. Just eliminate it.
Hope this helps.