Peppers falling blossoms
Plants that abort (shed) flowers are either stressed by environmental conditions (light, moisture, soil, temperatures, etc.) or too young to be flowering/fruiting. Are these plants growing inside or outside? (They should be outside.) Our recommendations for growing peppers in pots is to have only one pepper per about a five-gallon volume of potting soil (roughly a five-gallon utility bucket size); these plants are too crowded and as they mature will be competing for adequate light, moisture, nutrients, and may have issues with poor air circulation (which can increase the likelihood of disease). Plants this young should not be flowering; if they did keep their flowers and develop fruit, they may be too young to even ripen that fruit to maturity while surviving the process.
Have the peppers been fertilized? They look a bit off-color in the sense that they might be nutrient deficient.
Here is more information on growing peppers: https://extension.umd.edu/hgic/topics/peppers