This occurs due to HTML code entered inside of the link description inadvertently adding spaces. You will need to remove the HTML code to remove the extra spacing.
  1. Go to Core
  2. Select Communication > Resource Boards
  3. Search for the Resource Board post
  4. Edit the post
  5. Edit the link that displays above the spacing by clicking the pencil icon
  6. Click the HTML button in the top left corner of the Description box
  7. Delete the text in this box
  8. Click Update
  9. Click Save