How to fix problem with slopes and jump thru platforms?

Hi

I recently noticed in one of the projects I've been working on that my sprite with a Platform behavior on it does a small jump if it is moving down a slope and overlaps a jump thru platform at the same time. Is there any way to stop this from happening?

I tried making a smaller project and it still happens so I don't think it's related to any of the events in my other project.

Any help would be much appreciated.

Thanks

Example file:

dropbox.com/s/g08b2qh5rz2s1n5/Slopes_JumpThru_Problem.c3p