I entered an adjusted 1098 dividing all the numbers by 2 because I have a two-family building but it's displaying the full amount on my deductions. Does anyone know why?

Can you delete the 1098 and reenter? After deleting the form, I would clear your Cache and Cookies, before reentering it. 

Make sure you delete the form and any associated worksheets.

If you are using:

• TurboTax Online: see How do I view and delete forms in TurboTax Online?
• TurboTax Desktop:
  1. On the top right, there is a FORMS button.
  2. Click on FORMS.
  3. Locate the form you want to delete.
  4. Click on the form name.
  5. Below the form, bottom left, select DELETE FORM button.