A ceiling is only useful if the limiter catches the peaks that matter.
Cause
Fast peaks can slip through
Limiter overshoot happens when output peaks exceed the ceiling you expected. It can come from too little lookahead, release behavior, true-peak reconstruction, or processing after the limiter.
A sample-peak ceiling can also miss inter-sample peaks that appear during playback or encoding.
Diagnosis
Check the final output path
Measure after the limiter and after any sample-rate conversion, dithering, encoding, or post-export processing. A clean limiter output can still become unsafe later in the chain.
If overs happen only on sharp transients, adjust lookahead, oversampling, or the amount of peak control before the limiter.
Fix
Leave usable peak margin
Use true-peak metering and leave enough ceiling margin for the delivery format. Many streaming masters use around -1 dBTP as a practical starting point.
Meter Core shows true peak next to loudness so ceiling decisions stay tied to both level and delivery risk.