The math ain't mathing

[Real Atomsk]

I feel this could be applied to any stat in this game but it is frustrating that a total Attack Speed earned is displayed as +1.25e6% but my actual attack speed bonus is 7.8e5% and hasn't changed after 10 hours grinding it out. This isn't even counting the Nuke x10 so the gain should be another order of magnitude higher.
Is attack speed hard/soft capped at a certain point? Is it a textual display bug? Does custom scavenger not actually work correctly for rewards? No idea........

Anyway mini rant over, back to looking at number go up

[Mordtziel]

Every utility stat is affected by a diminishing return effect to prevent you from compounding to infinity in short order. For attack speed, that effect comes into play once you have at least 400% and the effect is ³√(17.5*raw+55). The effect gain section shows the amount of attack speed you have gained after this reduction instead of the raw amount you've farmed.