How to fix ROBLOX Animations being broken/buggy when playing my game?

Hello there! I decided to try ROBLOX animations today, and came across an issue. I have a set of animations and a script to run them one by one. When I press the "run" button in ROBLOX Studio, the animations work flawlessly, however when I press "Play" instead, and join the game, the animations seem to be somewhat broken/buggy. Is there any way to fix this?