That is odd. Could some animal be nibbling the shoots as they appear? Herbicides applied? Cultivation around the raspberries that may have chopped the roots underground? Check the health of your bushes—perhaps they are under stress. Has the winter been challenging for the plants, or has the weather been cold than warm than cold, for example, that might be confusing them? If so, perhaps they might recover and their roots start to explore soon.
That is odd. Could some animal be nibbling the shoots as they appear? Herbicides applied? Cultivation around the raspberries that may have chopped the roots underground? Check the health of your bushes—perhaps they are under stress. Has the winter been challenging for the plants, or has the weather been cold than warm than cold, for example, that might be confusing them? If so, perhaps they might recover and their roots start to explore soon.