Target's cheap knives turn every tomato into a wrestling match, don't they? Glad you saw the light before your salad needed a repair stand.

Mine used to do the exact same thing until I figured out the watering. Even if the top soil is dry, the bottom might still be wet. I switched to much bigger pots with tons of drainage holes and only water when the leaves look a little sad. They need a lot of room for their roots. Now my plants are huge and I have more basil than I know what to do with.