You can turn off the "Automatic Image Resizing", and test it again.  You can refer to http://cutesoft.net/developer+guide/scr/Automatic-Image-Re-Size.htm and turn off the "Automatic Image Resizing".

 

The security policy file (default.config, admin.config and guest.config) can be found in the /CuteEditor/Configuration/Security folder. Please open security policy , if you update the following setting to larger value and avoid the image resize, can you reproduce this issue? 

<security name="MaxImageWidth">1024</security>
<security name="MaxImageHeight">768</security>

 

Regards,

Eric