My item was soft rejected 2 times about "tag section" which I don't understand

Hi there, my item was soft rejected 2 times about “tags section” which I don’t undertand, this is the message from the reviewer:

All submissions should include at least one word for each tag category. Please provide suggested keywords in the “Tags” section in your submission in order to help buyers find your file. For information on effective tags, see our guide:

I think I’ve entered the wrong writing format in the tags section, because I gave “.” instead of “,”. then I fixed the error with the format corresponding to this link

After I resubmission then my item has soft rejected again for the same reason. Can someone help me?

Thank you

You need to click ‘Save Changes’.