How should my expenses for two offices add up to zero?

I have two home offices due to moving (one for Jan-Feb, one for Mar-Apr). I am confused by the prompt that says, "Let's split your business expenses between your two home offices." In the prompts after this one, I provide this information, so I am confused why it asks again beforehand.

I am especially confused by the line that says, "If you've already entered all of your expenses, the expenses for your two offices should add up to zero." If I re-enter my expenses for both offices, they will not add up to zero. How would they?

I will attach a screenshot of the prompt (without any of my personal information).

Please help clarify this!