Component description/label visible on preview?

Hi there,

I am editing a page on a website through Sites, which contains a grid. The change I have made was to the wording within the grid. Above the grid is a header sitting in a component which is labelled 'Header Group'. When viewing on edit mode this label is grey and faint just like all of the component labels, however when I changed to preview mode all component labels correctly disappear except for 'Header Group', which is now the same text colour and font as the page copy. Any reason as to why this might be?

I am reluctant to publish the page in case this wording also is visible.

Thanks