Published donation forms may redirect to a homepage when the Security Category is set to Administrator's Only.  To resolve this issue, update the Security Category of the donation form to General, or a custom security category that is visible to site visitors:
  1. Select Fundraising > Donation Management 
  2. Select the All Donation Forms tab
  3. Click Edit next to the desired donation form
  4. Under Security Category, select the correct security category from the drop-down menu
  5. Click Next or Save to save your changes