Live Composer Width Thumbnails on Blog Module

Hi Guys!
My issue using the Blog Module is that when I click on the Confirm button, after I use the Width option (on the tab Thumbnail, inside of the style tab) to resize the pictures, the pictures aren’t resized, they go back to the original size. How do I solve it? I really need to fix this, please help me. The support does not answer me. Look this GIF image.

https://gph.is/1Uiwapj