1 - fil7 you should start a garden journal for us to fallow.
2 - flowers on a pepper plant that are dieing off when pollinated is a good thing but it could meen lack of light.
I wouldnt worry about it too much as its not uncommon for chilli`s to dump the first set of flowers.
23C (74F) is fine for chilli plants. As long as the plant looks healthy i`d just leave it be and wait for more flower stems to appear.
Are they in containers or in the ground?
What are your night time temps? .... if the temps are too low at night they will also drop flowers , as will eggplant