Depending on the number of radials, if you have any, then you may have lobes. You may try redirecting any radials you have??? And depending on the number of your radials and location of them (off the ground?).
It may be a takeoff angle thing as much or more than a lobe. Radials, I think, tend to lower the lobe. I'm going to have to check that.
Addition: So when I check your location with a great circle kind of a thing (Google Maps Measurement) I see you are around 1,800-2100 miles from Washington, Oregon and Washington. Fairbanks is like 3,300 miles and Honolulu is 4,500 miles from you.
But then...verticals usually have low takeoff angles and do well on distance. But...if you don't have radials on the antenna then you are transmitting through a "dummy load" as some put it...which is overly harsh but you would be losing db's.