the problem with installing the picture in the frame

when I try to frame a painting in the lower-left corner, only its corner is set. what do I need to do so that I can install the painting completely?

<img width="1920" height="991" alt="Image" src="https://github.com/user-attachments/assets/f4a12cfd-514b-4e31-b02c-44c6fe0f1f85" />