my eyesight might not be the best, but it almost looks to me like in those first 2 pics you have 2 little green seeds starting to pop out of there. What you are seeing on the latest pic on the stem just looks like a swelled up calyx, maybe from having a seed in it.

but i'm almost sure those two first ones look like seeds. Although in my experience I've never seen the calyx split open until the seed is much browner.

Anyone else see the same thing?