Join this experience- 2D game - Roblox
I believe any experience, whether in game, or in studio has this issue.
Scale the roblox window down.
Move your character right, and without letting go of the “D” key, slowly increase your roblox window, or just hold the edge of the window.
While holding or scaling the window, let go of The “D” key, or whatever movement you are performing.
Notice that the Character continues to move, even though you aren’t pressing anything.
This looks like macOS native behavior for resizing windows, where key events are deferred until the resize ends. Since this isn’t a Roblox bug, I’m going to close this ticket for now, but feel free to put in a feature request for this and we may address it at a later time.