Why the digit sum keeps changing
The digit sum rule asks all digit characters in the password to add up to a target value. It sounds small at first, but it becomes one of the central constraints because many later rules also require digits.
The year 2026 contributes 10 by itself. Binary strings add more 0s and 1s. Atomic numbers and perfect square numbers can add several digits at once. The safest way to handle this rule is to leave adjustable digits that can be changed late in the attempt.
A practical way to manage the total
Do not solve the digit sum with one fragile number. Instead, keep a few separate digits in the password so you can tune the total when new numeric rules appear.
When a later requirement adds a number, recalculate the total before changing anything else. This habit prevents you from fixing one rule while accidentally breaking three older ones.