Striiv Calorie Adjustment?

I recently downloaded Striiv (mfp's suggested pedometer app) for my iphone and was surprised it automatically adjusted my calorie needs by so much. I work as a stocker at walmart so I am on my feet all day but I listed myself as active on mfp's settings. I only had the phone on me for half the day and it says that my daily calorie's burned is over 500 more than mfp is saying. Anyway, I was just wondering if anyone has used Striiv before and if I really should be increasing my calorie intake based upon it's suggestions.