Clodflare doesn't purge old images or generates new ones

Hi, I have enabled Cloudflare on a website again, but it seems the caché it’s not being purged, and it’s not generating the new images.

I don’t know why, it seems that all is ok. I mean, if I put the cdn url on my website configuration (Prestashop), CF servers me the images that has stored.

Thanks, and sorry for my english