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They reach anywhere from 3-6 feet tall and wide, sometimes a bit larger. These articles should help: https://www.gardeningknowhow.com/edible/fruits/blackberries/growing-blackberry-bushes.htm
https://www.gardeningknowhow.com/edible/fruits/blackberries/blackberry-pruning.htm

If it is what I think it is, it is simply due to seeds that were not properly pollinated. Ths summer has been hard on pollination of plants because of the high heat and humidity in most of the country. This makes the pollen stick together and pollination is not as successful as it should be. If it is pollination, these white cells are also shriveled and stunted. They are safe to eat though.

This article will help you to avoid transplant shock, which is what kills any plant that is not moved carefully:
https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm

My guess would be that you may simply be picking them too early. Most people tend to pick blackberries when they are a nice glossy, dark color when in fact you should wait for them to dull in color before harvesting.

The best time for transplanting is in early spring. Select a transplant site that provides full sun, air circulation and is well draining. Here is an article that you may find helpful: https://www.gardeningknowhow.com/edible/fruits/blackberries/growing-blackberry-bushes.htm

Blackberries are hard to kill, so transplanting anytime except during the mid-summerheat and drought should be OK. However, it is usually better to wait until the plants are dormant in fall. This article shouls also help: https://www.gardeningknowhow.com/edible/fruits/blackberries/growing-blackberry-bushes.htm