Why the Part moved

  • What are you attempting to achieve? (Keep it simple and clear)
    Why the part moved?
  • What is the issue? (Keep it simple and clear - Include screenshots/videos/GIFs if possible)
    Before start

image
After the start

  • What solutions have you tried so far? (Have you searched for solutions through the Roblox Wiki yet?)
    I tried to weld them. But doesn’t work

Did you try to delete the part and insert it again ? If not then you may try to reinsert the part…It might be a bug

1 Like

Why dont u anchor it? U could also weld it using weld constraint

Your parts are likely unanchored, meaning that they are moveable.

Anchored parts don’t move.

Unanchored parts can move, fall, and be pushed.

To anchor your parts, select the parts you want to anchor, and press the “anchor” button at the top of the Studio window in the Home tab.

I’ve circled it here in case you have trouble finding it: