Some images not load

Hello!
recently found out that some images are not loading, it is displaying an icon like this https://prnt.sc/T9E7AydSD2z2
and when I click to open the images on a new tab, it shows an error “We cannot complete this request, remote server returned an unexpected status code (400)”

when I disable the option from performance “enable site accelerator” all my images show correctly.
thanks!