Struggling understanding my own budget, help?

I’ve been working on a spreadsheet I built to help my wife and I budget. We both just started our first career jobs so I’ve been running calculations with our salaries as well as fixed expenses we already have (car payment and child care) along with slotting a certain percentage of each paycheck to our joint savings/investing. We have no mortgage as of yet but we will be having one in the coming months (will be building a house).

I have my spreadsheet set up to where if we have extra or any leftover money it will display the total but if we are spending too much it shows how much more money we would need just to break even.

I built the sheets so that it calculates all situations. I have a pre/post tax sheet for each paycheck (paid twice monthly), a pre/post tax sheet on our individual full month pay, then a pre/post tax sheet that combines the total we receive each month. On all the pre-tax sheets I built, we have extra money. However, on all the post tax sheets, it’s saying we need more money. The only post-tax sheet that it displays we have some extra is the combined monthly sheet. As far as a “budget rule” I have it made for a 65/25/10 split for needs/savings/personal use. (I apologize if I worded this section poorly and made it confusing)

Should I be concerned with the post tax sheets or should I just focus on the pre tax ones?