I knew there was something wrong, all my planets for my Yor tech custom race max population is X/122. This is too high of a max population.
In the YorTechDefs.xml it saids "Global".
<Stats>
<EffectType>PopulationCapYor</EffectType>
<Scope>Global</Scope>
<Target>
<TargetType>Colony</TargetType>
</Target>
<BonusType>Flat</BonusType>
<Value>6</Value>
</Stats>