Certified GKH Gardening Expert
No, it's not normal. You may want to get a soil test to see if it is due to a nutritional problem. It also could be improper watering. Palms need a deep watering about once a week and allowed to dry in between waterings. Palms should be fertilizied about three times a year with a fertilizer for palms.
In the meantime, you can trim of the edges to improve its appearance.