Hello,
This block has size 300×300 – https://prnt.sc/hrWhlW2QMlZd , but images are loaded 265×265 so they are stretched – https://prnt.sc/4c5zNyFYC8B0
Go to Edit page > settings of the element > Image size > select size. Please check cache and check the result now – https://prnt.sc/gyfsxI-OuHG-
Regards