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Your plants should be planted in good well draining potting soil.
Soil should be watered well, kept moist but not soggy.
If would cut back on the fertilizer, half strength, you want the plant to produce peppers not just leaves.

Fruit that is distorted can be caused by inconsistent water levels.

https://www.gardeningknowhow.com/edible/vegetables/pepper/growing-cayenne-peppers.htm

Peppers need heat, water and sunlight to reach their maximum heat level.
These links will help you.

https://www.gardeningknowhow.com/edible/vegetables/pepper/chili-peppers-not-hot.htm

https://www.gardeningknowhow.com/edible/vegetables/pepper/growing-cayenne-peppers.htm

These plants typically grow 2-3 feet in height. Yes, it can be helpful to use stakes or a cage (like those sold for growing tomatoes) to support it, but it's usually not completely necessary unless you get a heavy crop.

Can you include photos? Does this also cause bloom drop? Some peppers will turn black, or deep purple at the stem joints, naturally. A photo can help me to determine the cause of the issue.

Are these in container? The most common issue in container is overwatering. Especially if there are no drainage holes.

Isolate the plant from any other plants you have.
Treat with Neem Oil; every 3 days for 2 weeks.

https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

Bird's, along with many other non-mammalian creatures lack capsaicin receptors. This means that they don't have a way to feel the "burn" associated with peppers, since this is caused by a chemical response when attached to a receptor.

Without this receptor, there is no ability to feel a pepper's burn. It remains one of the safest alternatives without being a synthetic chemical, since many chemicals, while being largely harmless can still accumulate in the soil causing imbalances from petroleum based substances breaking down.