I am not able to delete file (images)

Hello,

Often I am not able to delete in any way the file jpg or other that I am browsing on Bridge.

Seems to accept the command and the program pass to the other image but the supposed "deleted" file is still there! (I do it wiht  by pressing CANC or right click and delete, same issue)

For delete them I have to move the file in another folder and delete the folder, or do it from Windows Folders.

Can someone help me to find a solution or undestand why it's happen? 

Thank you.