[NEEDS SAVES] Autonomously fighting loved ones

Product: The Sims 4
Platform:PC
Which language are you playing the game in? English
How often does the bug occur? Every time (100%)
What expansions, game packs, and stuff packs do you have installed? City living, get together, get to work Parenthood, vampires, Dine out, spa day, outdoor retreat Bowling night stuff, vintage glamour stuff
Steps: How can we find the bug ourselves? Have a household of vampires, mostly related with each other, wait until they start autonomous duels.
What happens when the bug occurs? Relationship levels drop from true friends to acquaintances or worse. Since parenthood it shows "conflct resolved" after the fight yet a full green relationship bar goes down to 25% relationship level.
What do you expect to see? I expect a duel without a loss of relationship or at least not a 75% loss of relationship.
Have you installed any customization with the game, e.g. Custom Content or Mods? Not now. I've removed them.
Did this issue appear after a specific patch or change you made to your system? Neutral/Not Sure 

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Having a family of vampires and this makes it a must have to install MCCC to counter the insane relationship loss. I dont see why vampires with good or great relationships duel all the time. They should spar anyway. This should be something for vampires with negative relationships.

In my case, it's just one Sim who starts fighting with his good friends. The fighter is a vampire and was created as one, however, I believe this problem is not entirely connected to vampiresim since he was fighting with his brother-in-law (a good friend of his) even before the latter one became a vampire.

Also, my fighter has hot headed trait, but he usually has no negative moodlet when fighting occurs.

Is this in Windenburg or another town ?

No, I'm pretty sure it's in every town. So far it's happened in both San Myshuno and Forgotten Hollow as those are the towns my Sim can be found in most often.

I have this issue as well with a sim. She is a hot-headed vampire (that has no negative weaknesses like hissing - worst weakness she has is sun phobia, which doesn't bother her because she also has never tense); she has earned all 5 positive traits (responsible, manners, sensitive, emotional control, mediator). She can be in the best mood possible with no negative moodlets whatsoever and suddenly fights someone. It doesn't really matter who it is. It will take a really high relationship and tank it instantly. I've yet to see any other sims in this save (or anywhere? haven't explored too much regarding) show such behavior. A guess is it's something to do with hotheaded and the parenthood pack? IDK It's sometimes good for the story line, but a very frustrating glitch.

It is normal for a Vampire to spar(fight) with another Vampire autonomously. (with a sufficiently high skill level)

If it was a spar, yeah, that would be pretty normal. This says "fight" in the interaction queue and behaves like a vampiric duel (found in the mean category). And, the sim she picks a fight with is not always a vampire. Anyway, the part that becomes frustrating is the relationship loss and the sim inflicted acts like it has the insane or mean trait (sim acting mean for seemingly no reason then acting nice the very next interaction). It's kind of kooky with those traits, but this isn't really. IDK if I'm explaining it well at the moment, just trying to help nail down what's going on a bit (perhaps badly).

I'll add this 

@Fierande

are they Vampires for you as well or all hot-headed Sims ?

Windenburg is a bit special as it has these 'brawls' that happen all the time so you have more fights that's why I ask.

Thank you. For me, I've really only seen this as a recurrent thing for sure with hotheaded Sims. One of my Sims had this problem just as badly before he was a Vampire as after. And no, these are not Vampiric Spars; it's just plain fighting. And again I should stress that at first I played him as a human and even then, he had this problem. I added a screenshot I made today where he can be seen autonomously fighting Caleb, whom he has an incredibly high relationship with, completely out of the blue (here he is actually a vampire). He was happy, Caleb was happy and they were having a casual discussion when it happened. There was no provocation/instigation at all. After this their friendship bar took an extremely big hit, as now it's only barely filled at all while as you could see, it was filled to the top before the fight happened. You may understand that it's kind of annoying to be forced to monitor my Sim all the time to make sure this doesn't happen again. 😛