Motion Video Effects Not Working

I followed the proper steps the get the Gaussian Blur to normal video effect where it starts out blurred and ends clear however the program doesn't seem to be working. When I try to add the effect it already has the stop motion selected and if I change the blur and then add a new marker later in the clip and set the blur to 0 it instantly changes the entire clip right back to 0 blur. Even if I don't add a marker and change the blur later in the clip it should set a new marker however it isn't working. I've tried to unselect the timestop next to speed and then reselect it to see if that would help but it's always the same issue, the markers do nothing and I end up changing the blur of the entire clip