It is easy to reproduce: Create a new game with the official Pathfinder 1st edition sheet (Note: it is PF1 ) Create a character, choosing to edit the sheet directly Enter the value two (i.e. 2) in the Temp Strength field Notice how Strength is now raised from 10 to 12. Delete the value in the Temp Strength field, leaving it at zero (i.e. 0). Notice how Strength is now back to 10. Now add a buff called "Bull's Strength" (or whatever, the name isn't important), and add "2 to Strength" Like the image below. Now click off the check mark in the newly added buff. Notice how Strength now is raised to 12 - as expected. Not click off the check mark so the buff isn't active any more. Notice how Strength is now back to 10 - as expected. Add the value two (i.e. 2) in the Temp Strength field. Notice how when you tab away or hit enter the Temp field is reset and Strength stays at 10. This is not as expected.