Why do I need a double slash in the path when I visit after uploading the picture?

Why do I need to access the image with a double slash in the path when I upload the image? otherwise, what is wrong with the configuration of 502
? Or is there something wrong with the code
[you can visit] http://www.deathghost.cn//art.
[502] http://www.deathghost.cn/arti.

Dec.10,2021

check the Nginx configuration. It looks as if there is something wrong with the Ngnix configuration.

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