It looks like it could be being caused by overwatering, or overfertilisation. Overfertilising a plant can somtimes "burn" it in a similar way we can get "chemical burns", and that can manifest itself in the foliage. The plant looks pretty healthy to me and I only really see anything worth noting on two leaves.

It definately does NOT look like that plant is being under watered at all.

Thats all I can think of really.

I fertilized with regular miracle gro all purpose soluble plant food mixed 1/2 tsp. per 2 quarts water as by the box instructions. I just watered it with this and did not spray the leaves with it. It has 5 leaves currently that are showing this burning. Should I dilute the mixture by say half next time or just forget about fertilizing it?