Fertility window change...

Hello, I am new to Glow and am enjoying it immensely. I have a question though, and am hoping somebody can help me. Right now my cycle averages 31 days. My last period started Wed. July 30 and finished yesterday (Sunday, August 3). Originally my calendar showed that my fertile window was to start somewhere around the 11th, but after completing yesterday's log last night, it suddenly changed. Now it's telling me that my fertile window is starting TODAY. Does that make sense...the day after finishing my period? Also, some other changes have occurred to my calendar that I cannot seem to fix. For example, it's now showing that I am going to have another period from the 21-23 of this month (I should get my next period around the 31) and have another fertile period from the 28 to Sept. 4. I cannot go in to fix this and my settings are still set correctly. Any takers?