Zero App - Categories - not set on single article through settings

Hi Balbooa,
I have several categories. To assign an article to a category, I right-clicked on the item, selected settings, then selected a single category from the dialogue - please see images.
The result was a category selection of " ,Florists". In this state, the article is hidden from the pages showing the Zero App Category root. I assigned around 20 articles this way, and they all stopped being shown.

To resolve this bug, I had to select the article and use "Move To" the category instead, a which point the category for the article was correctly assigned to "Florists" (ie. the initial "," was removed).

Could you please investigate why setting categories through the settings dialogue drop-down is not working.

Many thanks

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