No worries! That might be the problem yes. Or at least, it is what happened to me! Every summer there are a couple of rocket plants that sprout but the bolt immediately and do not produce leaves.

But as I mentioned, if you like the rocket flavour and as you clearly want some during the summer, try growing wild rocket (Diplotaxis tenuifolia). They grow year round and sprout anytime of the year. In fact, they are quite drought tolerant in contrast to normal salad rocket.

Best of luck!