Character won't collide with certain blocks

Hi guys,

I’m completely new to unreal engine and have been following some online tutorials to help he create a basic 2d side scroller for my android phone. I have run into an issue where the character wont collide with certain blocks. The character is colliding and running up a sloped block going to the left but will not collide with a sloped block going to the right. All of the other blocks appear to be working properly. Since i’m new to game development and unreal engine I am completely stuck and would really appreciate some help.

I have attached an image of the tile that will not collide and the tile that will