Marmande Tomatoes gone to pot.

Hi, I grow tomatoes every year, usually Marmande, San Marzano and a cherry of some type. This year, when I was planting them on into the greenhouse I noticed that just the Marmande have developed three sets of leaves then a small truss of flowers but no growing tip whatsoever. I've never seen this before and have no idea if they're saveable. It has happened with every plant so I'm guessing the seed were a bit dodgy. Has anyone else ever experienced this problem? Many thanks.
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.