Sizein kB of sam image optimized via Polish is much bigger then via cloudflare images

why is image:

(served via cloudflare polish with loosy compression and webP support enabled)

having a size of ca 340 kBytes

while the image:

which is served via cloudflare IMAGES , using a router which use a scaledown 3000x2000 pixels Variant

is having only 47kbytes

Orginal image is THE SAME for both verisons.

we puchased Cloudflare pro plan for 25 USD / month with the idea that we can store images on our server and cloudflare will deliver the best sized / formated images.

Now we have size of image about 10x bigger then using the cloudflare IMAGES.

What are we doing wrong please?