Upload images - Image name change

[Shimon Hirschhorn]

Hi,

I am having a strange problem.
If I go into a product via the VM backend and in the Product Images tab upload a new image with the same name as an image that is already there, it renames it.

eg.  I upload OH-TX-1.jpg and it creates a file OH-TX-15.jpg and uses that in the "Used URL" field. 
If I repeat this it will create more images such as OH-TX-14.jpg , OH-TX-17.jpg   ,  OH-TX-157.jpg.

What am I doing wrong and how can I stop this?

Thanks