Universal 2 - Increase Rush Damage by 10% - bugged?

How is this working?

Assuming this is on Christas Weapon. Normally, her rush without that weapon will deliver 750% damage. Using this weapon will:
a) deliver 750 x 1.1 = 825 % damage
b) deliver 750 + 10 = 760% damage
c) deliver 750 % damage

Collecting a few dozen data point pointed me towards c)
Anybody has a different experience?

Thank you,

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