Line 104 of Regression test plan indicates that expected results are "items revert to their original weights".

This exists in Production (1.5) as well.

Test scenario:
1) Create category. Do not check weight equally.
2) Add 2 or more items and assign different % of category values
3) Edit category and select weight equally and save.
4) Deselect weight equally and notice that % of category values did not return to original values.

Suggestions:
1) Return items to original % of category values when weight equally category option is unchecked.
2) When weight equally category option is unchecked, erase all % of category values for items and thus force the re-entering of % of category values by user.