Question Timeline rotation

Hello, i'm new to using the timeline in unity. I'm having an issue when I rotate the object in a keyframe, it seems to mess up the entire sequence. Like it launches the object into the air for the previous keyframes. So its ignoring what I did previously and just decides to keep increasing the objects X or Y value depending on how I rotate it. Sorry if you don't really understand or i've explained it badly but if you do understand, do you know how to fix it?