1st, to make sure I understand tou issue correctly, you are using the Human variant in the Community Pack? Correct?
If this is correct once you select Human as your race, on the race Tab. select Add optional Variant Trait. This should work,
If it doesn't. If it doesn't, then make sure that you have the 5E Cummunity Pack correctly installed. The Human Varient is not part of the SRD rules so it was added by the Community Pack. If neither of these are you issue get back to me and we'll try something else.
