Ok for tracking periods, not so great for ovulation

Thought this was a great app when I was just trying to keep track of my period. Then began using it to keep track of my ovulation schedule and found a big flaw. If your period is late or early, the app adjusts the previous months settings as well. I can understand adjusting the days of your upcoming months but to go back and change the days you were fertile for previous months is crazy. I am using an ovulation predictor kit and keep track in my notes part when I ovulated. It was 2 days after the "fertile" time and now when my period came late it says it was the last day of my fertile time and that was not true. Not a good app if your trying to keep track of things like that. I see no need why it should adjust previous months.

Macgirl811 about Period Tracker by GP Apps, v9.3.5