Blackberries wouldn't be grafted. When the canes first come up they'll be erect like yours. When they start to flower they'll bend over more. In the winter you cut those which have fruited. New ones will come up from the base.

The first year you plant the blackberries they will be spreading. The next years canes will be what is advertised, semi erect. They will be much thicker and will probably need to be pruned back to make them bush out. Whatever height you want just pinch back and they will bush out. I would pinch the lateral shoots again when they reach about 1 foot.

This is common with all the Arkansas Thornless Blackberries, first year they tend to need support

Looks normal..agree with the above.

Thanks everyone. The plant looks so different this year, I was concerned, but you have set my mind at ease.

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