Budgeted units change with budgeted cost

Hello, i have a question. My old company used to use $1/Unit for money tracking, and never used expenses. My new company i just started with only used expenses for tracking money as required by the customer. I loaded the schedule using expenses as requested. There are some activites that needed a different amount than was originally loaded. When i enter the lesser amount it is changing my budgeted units, lowering them below 1, but the total stays as it is supposed to. When i change the budgeted units back to 1, where i am told it needs to be for this baseline, it throws off my totals, by adding in more money. I've never dealt with this before, i've searched and couldn't find anything to help. I'm stumped, please help...

Thank you

Scottie Bell