Steps to reproduce

1. Log in to back office.
2. Go to Content / Content structure.
3. Start creating an Article content.
4. In rich text field attach image file
5. Being on Image picker, select 'Images' folder in the folder structure.
6. Click on 'Upload' button at the top.
7. Upload image file.
8. Select 'Form Uploads' folder in the folder structure.
9. Upload different image file than before.

Actual result:

After uploading image file (step 9) to 'Forms upload' folder, the interface shows both image files from 'Images' and 'Form Uploads' folders.

Expected result:

Interface only displays image file which has been uploaded to particular folder.

Note:
After refreshing the page, interface displays correct image files in particular folder.