Can anyone tell me why we had a bad day fishing?

Last year during the begining of July my family and I went fishing on the gulf stream trip of the Hurricane Fleet. We fished near the gate of the boat on the right side, and the 4 of us caught 100lbs of cleaned fish. This year we did the same trip only someone took the gate spot, and we fished from the left of the boat. We caugt 6 keeper fish in 12 hours using the same bait as last year. Can anyone tell me why we caught so much less this year?