Why do some player's defense not match their card?

SDS

I've been noticing that some player's defense attributes don't match their cards. For example, 99 Award Mantle, 99 ASG Acuna, and 99 Milestone Biggio all have diamond defense on their cards. In games, though, they show gold defense on the field.

Does anyone know why?

SDS

On the card shows overall defense. Arm, Accuracy, and Reaction included. In game is strictly the fielding attribute

SDS

Ah. Thank you!