My numeric field displays record number instead of value in ""view"" mode but displays correctly in ""Edit"" mode. How do I fix this?

For me it worked if I selected the "Read only" option on the form editor field list. Granted, it's read only by the nature of it being a lookup field anyway, but ticking it caused the correct value to display. I know this answer is years old, but I found it whilst looking for my own guidance and figured this might help others.