brown spots on tomatoes

[noqgardener]

But it they are only on a few tomatoes on 2 of my Jetttsetters (the other 2 jetsetters, 2 giant tress, better bush, green zebra, yellow pear, 2 beefsteak, and golden boy don't have them and they are all in the same row) what could it be and how can I prevent it from getting on my other plants?
thanks in advance