Several Issues

I am in the process of integrating the gallery into my mobile app. But I feel this component is no poorly organized. Am I missing something? Here are my concerns:
(1) When I delete the images from a category in the backend, those images are still there in /images/bagallery/gallery-1/compression folder. Why?
(2) When I delete the images from a category in the backend, those items are still in the database in the #__bagallery_items table. Why?
(3) In the #__bagallery_items table, the value in the category column doesn't match the id or alias of the actual category. Why?
(4) The full path of the image in the gallery is /images/bagallery/gallery-1/compression/7-squidlips-networking-flier-04-18-24.webp . But this value is not stored in the database. Why?

Thanks,

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