Q.Some Of My Sprouts Last Year Grew To About 2foot 6 Inchs But It Had No Sprouts On It
when i put in this years plants i put them deep and stamped all round the plant i have been growing sprouts for 20 years and this has happened quite a few times over the years

Certified GKH Gardening Expert
It could be that the roots had been compacted. I would not stamp them in. Rather, watering them in should suffice to set the soil around the roots.
Be sure that the soil is as uncompacted and airy as possible for the plant.
https://www.gardeningknowhow.com/edible/vegetables/brussels-sprouts/how-to-grow-brussel-sprouts.htm