Sorry but that part of the story tracker is not helpful in this situation. I can only guess whats wrong with the information you provide. Them fighting sounds a lot like they're both pregnant, which is an automatic fail condition for forming the home harem.
'
I'll give you all the info I can.
Time: Monday 8 Spring (I read that some events can only be triggered in a certain season)
Bree: Kinky 50 Love 75 Lesbian 55
Bree's love is still stuck at 75 because her routes aren't complete yet, events don't trigger.
Example:
In the "Bree route" I should see her cosplay of Bowsette, but when i go to her room at the set time, nothing happens.
In the "Maid Bree" route, i would have to wait until the end of the shift, but even here if i show up at the maid cafe at 6 pm, nothing happens.
Sasha: Kinky 60 Love 100 Lesbian 65
Sasha's route is complete, she's not the problem.
I have Minami in the house, but i can only date her as brother, because her "siscon" route is not complete yet (i should meet her on Saturday afternoon)
Bree and Sasha are definitely not pregnant.
Neither girl wears a collar (I don't know if it's for the trigger)
I slept with Bree and Sasha within 7 days long before they got the stats needed for the harem.
I didn't know about the harem, as soon as i could i date them (and of course, i had sex with them)
Now, the wiki says:
Be aware, if you trigger the confrontation with Sasha and Bree without fulfilling the requirements, then one or both of the girls will leave.
Maybe i had to first reach the necessary stats for the harem and then sleep with them within 7 days?
Thank you again.