Non-required fields flagged as being required after clicking in the field

[pascalflohr]

Bug Report

At times, when clicking on or going into a non-required field, and then deciding not to enter information, the record cannot be saved and a notice appears requesting all required fields to be entered, even though all required fields have in fact been filled in. Examples are when going into Disturbance Effect 2, or Interpretation Function 2. It does not always happen, when I tried to reproduce this, I could not, but I have seen it happen half a dozen times now.

Expected Behavior

When leaving non-required fields blank, whether or not I clicked in it, the record should be saved without problem.