The Omega Research Center only gives a level bonus of 1% while all his predecessors give 5% per level.

"Oh glorious leader we have just complete the Omega Research Center and it is a great success. We can now employ five times the number of scientists while retaining the same amount of scientific output. This is a great stride for the scientific community."

"You do mean with the same amount of scientists they will generate five time the output, don't you?"

"No, oh magnificent leader. The chief architect was afraid that would lead to mass unemployment under the scientist and that would be bad for morale. So he successfully designed this highly inefficient improvement, and thereby succeeding in this magnificent waste of man power."

"Rrrhhhaaa."

"Your eminence?"

"Chief Scientist...."

"Yes your greatness."

"Can you do something for me?"

"It will be my pleasure, oh commander of all things in the universe."

"Can you get the Chief architect for me?"

"It will be done as you wish, oh mighty ruler."

"Also please invite the Chief Executioner to the meeting."

The xml (ImprovementDefs.xml) states

<PlacementType>WealthUnique</PlacementType>
<IsGalacticWonder>true</IsGalacticWonder>

...

<LevelEffectStats>
<EffectType>Research</EffectType>
<Scope>Global</Scope>
<Target>
<TargetType>Colony</TargetType>
</Target>
<BonusType>Multiplier</BonusType>
<Value>0.01</Value>
</LevelEffectStats>

leading me to believe the multiplier value should be 0.1 instead of 0.01, which would give a level bonus of 10%.

And i think the placementtype should be either ResearchUnique or ResearchHub.

Correction:

As AlienFromBeyond pointed out the percentage is probably right, if it is intended as a wonder