Why is your monster pet shop purple

The reason is, you cheated by changing the time or date. Causing the program to find out that you changed the time which suppose to make your monsters grow faster. However, the program detected it and therefore did not make your monsters grow faster. This will not allow any of your friends to enter your pet shop until it turns back to normal color. It will turn back to normal color when the time to changed forward is completed. This may not be true, because I found this information from the internet and mine didn't appear back to normal after. The program takes the time from its server and matches it with your device time. Having a few minutes faster or slower does not affect. The best thing to do if your game is not valuable, is to reset it by going to the settings page and select ERASE DATA.