Attack synergy

JustPNC007

Trying to determine if this is a bug. I've been been using 4* Mag, 5* Cyclops, 4* Yellow Jacket, and 4* Antman with no other masteries that would improve my attack other than strength and greater strength (1 in each). Those four champs add +6% attack each. No matter who I add to round out that team it appears that my attack is 4 less than what I calculate it to be. I've looked at multiplying the champs base attack x 24% as well as individual multipliers (+6% +6%...) in case the value would some how produce a lower value. I'm not seeing where the 4 points are being reduced from. Checked with support and they are idiots who can never seem to read or comprehend my tickets until at least response number three of me screaming to read my damn ticket. Since they keep pointing me in this direction I figured I'd let you folks help make the determination (not that they're idiots...we already know this) if their attack synergy calculation is adding correctly. Thanks