The scale stops at the keyframe but the clip keeps zooming.

I tried to fix this problem in any way. I know I'm probably doing something wrong because it works in most of the clips I use.

I was trying to zoom in and zoom out of the same clip. I slowed the speed at the point I wanted to zoom in and made it faster when I wanted it to zoom out. First fase done, the problem comes up when I keyframe to zoom in & out.  When I scale the clip, using keyframes, the scale stops but the clip keeps zooming for 12 frames. With the clip zooming in when I want it to start zoom out is a problem...

Please help me, I'm desperate....