Known bug?

Is anyone else having this issue? I have an iPhone 5. I've been having over a week.

Whenever I try to update my calories allowed it defaults back to 1200 calories. I have played around inputting maintain or lose xxxx amount, sedentary or highly active. I will see the increased calories but as soon as I try to add something or change the view (hit home) the calories allowed automatically defaults back to 1200!