Box glitch

I’m semi new to unreal. I’m in a gaming college degree about halfway through so I’ve been with unreal for a bit just not super good. Anyway our team has a project to make and I’m scripting. I was using the 3d sidescroller base and had puzzle mechanics by pushing boxes. Everything worked until I started adding scripts to make checkpoint and respawns. I also added rag doll when you die, but now when I jump against a block it will rocket away. If another box is stacked on another and I jump on it then it will try to morph through the bottom one and both will launch away. If I could get some help before we proceed with the visuals of our levels .thank you