Weird physics interaction between character movement component and Movers using Matinee

In my current project Using the default character movement component, there seems to be an odd physics interaction when standing on a horizontally moving object controlled by matinee. When the player lands on the moving platform it will move the player off the platform in the direction that the platform is going. It looks like a conveyor belt is pushing the player off. When the platform in still and the Matinee has not been played yet, when the player jumps straight up without any left or right input, the player will jump as if it was given X positive input. Is there a way to get around this or is this. I would prefer to use Matinee for environmental animations like that.