What are they? Could of got mislabled plants. Not all small varieties are cherry, there are others that are small also.

There are many small-fruited varieties available as drtomato said so without knowing the name of this particular plant it is impossible to know if this is normal or not. That is why it is always good to do some reseach on the name of the plant you buy so that you know exactly what to expect from it - any keep the name tag. ;)

Further, large-fruited plants that are hybrids will also produce some small fruits depending on weather, growing conditions, and fertilizers used. And nursery plants can be mis-labeled.

So are these plants in the ground or in containers, fertilizers used and how often, weather conditions, and most important the name of the plant would be good to know.

Meanwhile just enjoy the small fruit. ;)

Dave