!!! ATTENTION !!! BE AWARE !!!

That's a lot of tabs

View attached image.

Lmao :P

From the sounds of it, they had the full version of Handsome Collection already activated through a ROW or WW key (note their "PROOF" image link above, showing activations from 2018), but were still able to activate Handsome Collection for another region
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This interpretation is quite feasible, as keys with different language settings have been known to activate on accounts that already own the license; However, it's been a few years since I saw that discussed on SG, so I forget the exact specifics of it (though I recall staff discussion on it, so perhaps Khalaq, as an older and more knowledgable staff member, would recall the details).

Iirc, there's a potential benefit in being able to get different language packs for a game (when those are limited per license), though your most recent activation'd be the only one actually accessible on Steam, so you'd need to fiddle around with license deletions (and undeletions) to swap between the licenses. In other cases, I believe it comes about due to games having different publishers/store pages (visible by region), and thereby being treated as different apps for activation.

Not sure what's going on with Handsome Collection, but (as indicated above) it does seem as though there'd be several niche circumstances where you'd run into issues allowing for duplicate activations. As a possible guess, it could simply be due to Handsome Collection only being listed as a bundle on Steam, which is an infamously quirkly configuration. The package (ie, key) version might register as its own unique activation, on account of being a package (in other words, you own everything in the package, but not the package itself). Of course, that guess only really works if the OP bought the Steam store bundle version to begin with, rather than a WW/ROW key activation, as they indicated.

In any case, as you touched on, using the license activation page to attempt to determine any sort of license information is always a disrecommendable course of action: It's rare you get any useful information (and I believe the only region-related response is simply along the lines of "can't activate in your region" and, further, I believe that'd be be overwritten by "you already own the content" when applicable), and the risk of activation is always there.

Yes and i apologize fot that, sorry.

Well they did bring out a new borderlands 2 dlc ready for borderlands 3 so it could be as simple as gaining that 1 dlc which screwed them over. Or it is what sooth put above about how the bundle and junk works

It's not just a matter of owning the apps or not but actually the depots that a package contains. You may own all the apps already but if you're missing any depot that is in the package that you try to activate a key for then you can and will. Potentially gaining an additional language depot but it could also just be an empty depot. The problem exists mainly due to terrible product management by the publisher.