Tag become number when add new post or update post

  • Hi everyone
    My site has a problem but I can’t find any solution. Tried Google but can’t find yet.
    I add a new post and type some more tags, when I publish, this tag become number.
    Ex : can ho gia re, can ho gia re quan 7 –> 120. And this number continue increase if I delete it and try to type the string tags again.
    Sometimes the tags don’t change to number. But when I update post ( update content only), sometimes tags change to number and my old tags disappear.
    It’s so annoying. So anyone can fix this? Thank you very much.
    My site : https://canhosinhloi.com
    The post has number tag :
    https://canhosinhloi.com/vi-sao-khach-hang-noi-khong
    You can see 199 beside “Th?”.

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