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It could be that your soil has too much nitrogen. Beans do not need a lot of nitrogen. All beans are nitrogen fixing plants so be careful to avoid heavy nitrogen feedings, as nitrogen-rich soils result in excessive vine growth and little to no beans. Try adding some phosphorus to the soil. Heat can also be a factor, making pollination more difficult. This article should also help: https://www.gardeningknowhow.com/edible/vegetables/beans/bean-blossoms-no-pods.htm

This article will help: https://www.gardeningknowhow.com/edible/vegetables/beans/soil-inoculants.htm

This article should help: https://www.gardeningknowhow.com/edible/vegetables/beans/bean-blossoms-no-pods.htm

This can be attributed to a number of things, such as poor pollination, irregular watering, or the use of nitrogen feritilizer. A lack of pollinators can cause beans plants too produce less or develop poorly. Plants also need additional watering once they begin blooming. Since these are nitrogen-fixing plants, they do not need fertilizer, with exception to a side dressing of compost, if desired. An abundance of nitrogen will cause little to no flowering and poor pod development.

Also, could you be picking them too soon? If pods are harvested too early, they will not have finished their growth and the beans inside will be far too small.

Have you asked your local garden center? There should be plenty of sites on the internet offering these seed. Good luck.

It sounds like a virus of some type. You might consider taking samples to your local agricultural extension office for testing and recommendations. In the meantime, this article might help: http://www.clemson.edu/extension/hgic/pests/plant_pests/veg_fruit/hgic2200.html