Triglavian invention chance different from expected

Hello,

When I try to do invention on a triglavian ship I get 50% bonus coming from my skills.
I was expecting 45.8% from the regular formula
Formula (skill modifier) : 1 + EncryptionLevel/40 + ( Datacore1Level+Datacore2Level ) / 30
-> 1 + 5/40 + (5+5) / 30 = 1.4583333

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So is there another formula for Triglavian stuff and is it for all Triglavian invention ?

I’m not using any implants by the way.