How can I change the properties so an object stays floating during PlayMode

[awyrls (moon)]

Hey builders! Im currently in the progress of creating a water feature for my game, but as showed in the images below, in Studio, BuildMode, both of the objects are above water, (unanchored) but during testing (PlayMode), only one of the objects is floating, and I wondered how I could change the properties on the object that sinks, so it can stay float. Thanks!!

[Crazedbrick1]

Try changing the mass of the part.

[awyrls (moon)]

I’ve tried that multiple times and it still doesn’t seem to be working