Local script visible to all players

[dthecoolest]

Even if its a local script, physics still replicates automatically which triggers other peoples local script.

This should be related to your problem:

Why is my touch event local script firing for everyone else

I made a brief tutorial about this issue. To summarise: you aren’t checking if the character who touched the part (if one exists) belongs to the LocalPlayer. Touched will still fire for all clients because a part that is visible to them physically intersected with the part that has the Touched event so you need to confirm that the touching part belongs to the LocalPlayer’s Character.