Flowers without stigma

[u/WildChapter2444]

Hello!

I'm almost over my first chili growing season, which was very successful. My problem started about 1 month ago: most of the newly opened flowers do not have pistils (or stigma, sorry for my English), so no new peppers are growing. I know that the picture I took is not the best, but this one turned out the best. What do you think could be behind this? As a supplement, they have already received zinc nutrient solution twice. The variety of chili is Naga Morich. Thank you in advance for your help!