Weird glitch!

For some reason itll tell me Ive used 585 MB of data, and when I check my usage on my phone, it shows that only a hundred have been used. Doesnt make any sense, its been happening since I got this, so I deleted it for the sake of my sanity.

Hijk123-789 about Megabytes - Cellular (3G/4G/LTE/GPRS/EDGE) data usage on your Home Screen / Lock screen / Notification Center & widget, v2.0.0