It wasn't a grammatical error they were attempting a sort of triple whammy of puns
CatSize = Cat's eyes = light, so see their light
Their light = they're light = dieting
Too many puns in the one package, basically,
CatSize = Cat's eyes = light, so see their light
Their light = they're light = dieting
Too many puns in the one package, basically,




this when they won the task, for all of the above and this entire thread.
How come nobody on the programme noticed it... (or stopped to think about whether it made sense before printing it on the label?)