this is the third year a bloom starts when branch is dividing. never gets past this.

I'm baffled by the problem you have. It looks so happy and healthy!

maybe it's too leafy. remove some leaves and give it a fertilizer high in phosphorous, but not too high as it will not be good over the long term. 20 to 30 P

I've had a plant do this. Not 3 years in a row tho. It looks crowded. Maybe move it away from the crowd, change water habits, a little less sun.
Sometimes they just don't cooperate. That's why I have 15 plants, always gonna get blooms and some disappointments. Don't stop trying😎

I would try a fertilizer with a higher "p" in the NPK ratio. You do have some leaves in the upper left side battling something. Don't know if it is fungal in nature, too much sun or what.