Issue
New UI styling appears in Studio testing but disappears or differs after publishing.
Cause
The experience may depend on a beta-only behavior, unsupported selector, or stale published version.
Fix
Confirm the styling feature is fully released for the API you use, publish the correct place, and reduce the rule to one selector and one property. Check rule order and specificity before adding overrides. Avoid maintaining duplicate script styling that fights the style system.
Verify
Join a fresh public server after publishing and inspect the same UI state on desktop and mobile.
Official Roblox weekly release recap
#1
Original Heliotrope guidance with authoritative Roblox sources.