Does the lifesteal from multiple Satanics stack? Is it supposed to?

I've been looking at some machine learning dota builds lately and I've started to notice they go a little off the wire and get stuck in loops of like building multiple daedalus and multiple satanics. This has started to make me wonder if the lifesteal from Satanic is supposed to stack. It's marked as a "passive". The wiki says lifesteal stacks additively. But I see no mention of whether this only applies to lifesteal from different sources, or lifesteal from the same item. Either way, I couldn't find a definitive answer on this. So I set out to do a little of my own research...

In Demo, I've noticed that if I have > 2 Satanics I fairly consistently (but not always) seem to heal twice per attack. There is an occasional attack that only heals Drow for one instance of 30-ish health. Something you can see at the top of the log here, but most cases seem to apply two separate heal procs for about 30 damage each. Something that would be around 25% of the lifesteal I'm supposed to have.

https://preview.redd.it/f8hksi23w9381.png?width=2328&format=png&auto=webp&s=1fca5bcb3999b808ea49756a2806cfc6e903f9e8

But any more Satanics than that and I still only heal twice. I think I seem to be more likely to heal twice per attack like this, I've seen far fewer instances of just one heal proc.

https://preview.redd.it/y8w56txsv9381.jpg?width=2311&format=pjpg&auto=webp&s=c2e658122c0015da51a7229fb2df644c240ad104

And just as a baseline comparison, with one Satanic, I only ever heal once, per attack.

https://preview.redd.it/27jpp5hsv9381.png?width=2318&format=png&auto=webp&s=b3a36a16502fce05aef9af4ea561964c8ba50323

So what the fuck is actually going on here? Am I supposed to be getting one single 25% heal proc no matter what? One proc per Satanic? Why does 2 Satanics heal me twice? Why does 4 only also heal me twice?

Is this an error in the combat log?

A potentially game breaking exploit?

Can someone tell me how this is supposed to interact?

EDIT: for further completeness, the double proc also seems to apply to unholy rage.

https://preview.redd.it/ohjozsy3y9381.png?width=2326&format=png&auto=webp&s=7c9c10db46f04c9adf4d53e645a4b7d1e4c297ac

submitted by /u/GaysWithaZ
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