Avoid having files names like my_mockup.bmml.bmml

I thought I was crazy - for weeks now I could not figure out why I am getting some of my mockups to have a .bmml.bmml extension. I even have a few that are .bmml.bmml.bmml.bmml

I now realize whats going on, but I wonder if anything could be done to avoid it? Maybe I am crazy?

Here is why it happens:

1. Create a new mockup
2. Click file>save
3. Type in the name as 'my_mockup'
4. Click [save]
5. Clone the mockup
6. Now click file>save-as
7. when the dialog appear, click the file you want to save it as (instead of typing it)
8. Notice the warning message telling you that it will overwrite it
9. Click [OK] to overwrite it

Now look what it has done: