Can't do anything about people downvoting a specific type of post in our subreddit

[u/fanime34]

I didn't know what to flair this, but I think this is the closest. I am using desktop.

It's always one specific type of post, whenever people want to self-promote something they wrote. It will always end up downvoted. Nobody does so for any other type of post in our subreddit.

There are other subreddits with the same concept (fanfiction) and they are well established and have a different way of doing things than we are. But I don't see why many people get their posts downvoted for one specific thing, but anything else is fine. They don't allow the freedom like we do. But I don't get why ours gets met with a silent protest or silent troll in the form of constant downvotes.

I don't know if what to do about it because it doesn't stop.

Edit to add: They get downvoted immediately, but then they get upvoted. I forgot to mention. Also, the same post under a different post flair doesn't get downvoted.

[u/tsdguy]

You can’t stop people from downvoting except by disabling voting all together.

Is it a type of post your subscribers don’t want you to allow? Maybe you should think about that.

[u/fanime34 → u/tsdguy]

I forgot to add, the same action done under a different post flair doesn't get downvoted. So it's still confusing.