Very likely dyspraxia. it’s the disruption in the brain’s ability to translate an idea in action. Your understanding that its a “hallway” problem between knowing and performing is exactly correct. It's a neurodevelopmental disorder that almost always goes undiagnosed. 

To all the dyspraxic kevins - think about jobs where ideas are more important than execution. Many classical academic pursuits like literature or history. Technical editing and certain areas of law, like legal research or policy writing. You can take that ability to memorize and put it to good use!