Img URL automatically changed after uploading

Hi supporting team,

I was uploading products and have provided an img URL in the CSV file like

http://jetnorthjets.com/WP/wp-content/uploads/2019/12/xxxx.png (xxxx varies according to SKU)

However after uploading every product img URL becomes:

http://jetnorthjets.com/WP/wp-content/uploads/woocommerce-placeholder-510×510.png

And thus it won’t show at the page.

Can you kindly tell me where I did wrong and how I should fix it?

Thank you so much!!!

Leo

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