I'm creating a lightfoot halfling bard via 5e Companion App, and it automatically added a proficiency to Acrobatics. Is that legit, or do I need to remove it?
Lightfoot Halflings do not get any skill bonuses
They have the Lucky trait:
When you roll a 1 on the d20 for an attack roll, ability check, or saving throw, you can reroll the die and must use the new roll.
They have Brave:
You have advantage on saving throws against being frightened.
They have Halfling Nimbleness:
You can move through the space of any creature that is of a size larger than yours.
And they are Naturally Stealthy:
You can attempt to hide even when you are obscured only by a creature that is at least one size larger than you.
They also get +2 Dex from the halfling race, and +1 Cha from the lightfoot halfling subrace.
Dexterity is tied to Acrobatics, and so the +2 racial bonus will increase Acrobatics by +1. Any proficiency with the skill would be from a class, background, or gear.