If the heart is red already you must turn it gray then red again!!
Remember --Etsy gives each of us only 300 hearts per hour. Make sure you are not out of hearts when playing game threads. The hearts refresh at the top of every hour. Example: 1:00 o'clock, 2:00 o'clock, 3:00 o'clock. You need to check your Favorites List to make sure your hearts are sticking. I- pads and I- phones don't seem to make hearts stick all the time. Please do not play if using these devices. It makes it look like you are not faving your teammates.
