A weakness of the types of LTM?

Contradictory research from Buckner and Pertersen. Found that semantic was on the left of the pre-frontal cortex and episodic was on the right. This was from nueromaping. Contradicts the research, unclear where the long term memory stores actually are - lowers validity. But this was in 1996, nueromaping was in the infancy stage, repeated now might not get the same results.