There is a small bug with the "my rules" that I am aware of and have on my list to get corrected. This will happen on values of 0.
For example, let's say you want to put a 1 or a 0 in for a player, indicating if they are starting or not. If you try to do this and say you want each lineup to have > 8, meaning 8 starting players, this will not work. The bug is with 0 values, any value of 0 will be treated as a 1.
As a quick workaround for the above example, you can do something like set all players starting to a value of 10. Then say you want a minimum of 80 for that rule.
Let me know if you have an issue with a rule other that is different than this example and I will take a look.