(with video) Unable to resize my image can only resize the box that contains the image

Hello everyone,

Here's my problem : I'm unable to resize my image by double clicking the target in the middle of it. Usually when you do that, you can edit the size and move around the image in the box. But in my case it lets me only resize or move the box.

Here's a video showing the problem :

https://youtu.be/GiAg1_3SBP4

Thank you very much in advance for your help.