At least in the database the numbers are showing as +20% Tohit and +40% Damage, when in game they're listed as +25% Tohit and +50% Damage.
They're showing up as +25% ToHit and +50% Damage in my copy of Mids'. Are you sure you're not looking at Corruptor's Forge? My Mids' numbers match the numbers I'm seeing in-game for both, and Corruptor's Forge is +20% ToHit, +40% Damage.
Nevermind. Apparently the database lookup works using whatever AT you have loaded, which is what's showing me the numbers that are off. So if I look up a Defender ranged set with a Blaster build, it'll show me damage as if for a Blaster. :P
I was looking at the raw numbers with an Arachnos Soldier build up there.
You can chance which archetype you're looking at the numbers as by clicking the archetype name in the power info popup.