It might be to do with how you have set the alert up. Can you post screenshots of what you have configured.
Better still, you might want to try the Advanced Alerts as these have far more flexibility.
Thanks for your response..I actually found the problem, I overlooked the fact that I had selected the Reset value/setting the same as the the trigger. I had the trigger set as Greater than 85% as well as the Reset.
Thanks again for responding.