Did you have 3 classes before in your dataset? It looks like existing features had 3 different ones. I just recreated your Image and Object Detection blocks and now the number of classes are correct.
Yes, the project once had 3 labels in the dataset. I deleted one of the labels and the project output classes got misaligned between the Create Image block and Object Detection block.
I was hoping
there was a button I did not know about that would reconcile the Create Image block and Object Detection block if they get misaligned or
there was a quick Keras edit I could make.
So if one removes a complete group of labels, then they must remember to recreate the Image and Object Detection blocks.