Custom Labels not updating to Google Merchant Centre

I’m having problems with the custom labels for my Google Shopping Feed. Firstly, when I try to change them on the feed settings within the plugin (changing from pa_type to pa_collection for example), the changes don’t save.

I have pa_collection for custom label 3, but I wanted to create a google shopping ad for a very specific list of products (Christmas Soaps). When I checked the feed the pa_collection for those products was too generic (festive) so I updated the pa_collection for all the Christmas soaps to ‘Christmas soaps’. Regenerated the feed on the website, checked the changes had saved by opening the file. I then reuploaded the feed to Google Shopping merchant, waited half an hour, but the custom label 3 still showed ‘festive’.

I’ve tried several times over the last 24 hours, but no change. Please advise, thank you

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