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Magneto + Loki synergy broken

The Masterminds Lv. 3 synergy says, “All champions gain +20% Energy Damage once a Combo of 15 or more hits is reached.” However Magneto is only doing 10% more damage after 15 hits. Tested with 6* Magneto (Marvel NOW!).
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People will need a lot more information to say for sure if you've found a bug or not.
I was using my 6* 1/25 unduped Magneto (Marvel NOW!). 6* Loki was the only other champ on my team. I was fighting ROL WS. I was measuring the damage from my non-crit medium and light attacks which was 1057 and 678 before the synergy kicked in and 1170 and 750 after.