Glow seems to be off ?!

Last week was suppose to be my fertile week... But when I logged on the app today it switch to this week. I'm confused! Why all of a sudden I'm fertile starting august 8th tFriday all the way through Thursday August 14th, but yet it was lit up green last Monday August 4th all the way through Sunday August 10th. It just through me completely off. None of my info was changed at all either.