I am on the FRS and the VAT return is not showing the correct amount when adding RC SG

I am having Two problems. 1. I am on the FRS. When i enter an expense (RC SG) it adds 0 to box 1 but adds the amount to box 4. Therefore reducing my total VAT due. This seems incorrect as it should cancel each other out? If i go on the expense specifically it states Memo Subtotal £38.88 VAT @ 20% on 38.88 7.78 VAT @ -20% on 38.88 -7.78 Total £38.88 This seems to be right on the expense line but not on the VAT return? 2. Box 7 (Net value of purchases) is showing 0. This is despite there being many expenses and purchases. Is this correct?