What's better for a novice as far as TC Division, Round, Truncate, or Floor?

And, My True Count seems to be off:

When I go into the True Count calculator and see the TC Division is set to Round, under Counts it says: Remaining Decks 4, Running Count 2, True Count 2. Shouldn’t it be 3?

When I switch it to Floor, it says: Remaining Decks 4, Running Count 15, True Count 3. Shouldn’t it be 3?

Exactly which Settings am I supposed to check?

Thank you.