Image settings not working!

Aloha, please help someone I am completely stuck. My image settings for products on the shop display products are not working! Regenerate thumbnails plugin does not work either.
When I change the image dimensions in the settings and then save them they just go back to the default ones that were already there. No idea whats up should be really simple to just change these settings and them images will be resized when importing products. But as usual its not simple.

Please any help would be very appreciated.

Mahalo

https://wordpress.org/plugins/woocommerce/