monsters – How is the Ogre’s greatclub damage constructed in Pathfinder?

I’m currently working on a roll20 script which will automatically convert a creature using the rules of Animate Dead. Now I ran into an oddity while trying to recalculate the damage and attack for the greatclub attack of the Ogre.

The attack is listed as follows

Melee greatclub +7 (2d8+7)

The +7 attack is understandable (+3 bab, +5 strength modifier, -1 size modified = +7), but the +7 damage has me puzzled.

The docs mention the following about how damage is calculated:

When you hit with a melee or thrown weapon, including a sling, add your Strength modifier to the damage result.

But this would mean that the damage for the greatclub should be 2d8+5 and not 2d8+7. So where is the additional +2 coming from? The ogre also doesn’t have any feats that would increase this number.

I’ve looked into the Table: Weapon Damage Size Conversion as the Ogre is a large creature but this doesn’t say anything about +2 bonus damage.