Image crop is buggy - reverts to original size, can't make smaller or move

When using templates in Adobe Express the image needs to be moved or resized within the frame, and it will let me make it bigger but not smaller, and the image keeps almost reverting back to the position it was previously in when moved like it’s magentised back. eg if I drag it to the left using the mouse it just swings back to what it was before i moved it. I can move things only using the arrows, but this doesn’t help cos I can’t make items smaller to fit the crop box. 

I have a video clearly showing this but can’t seem to upload.