How to scale a symbol?

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I have a symbol that looks like this:

When I use the transformation tools to scale it, it goes all strange:

Why is this happening? How can I fix it?

This is what I see when I double click on the symbol:

Here is the file in case anyone wants to download it and try it: http://www.filedropper.com/file_293

I am using Illustrator CS6, but symbols have been around for a long time, so there must be a solution to scale symbols, as I can't imagine people struggled without being able to scale properly for the many years that symbols have existed.

[Doug A Roberts · Accepted solution]

In the symbol panel menu, select 'Symbol Options', then untick 'Enable guides for 9-clice scaling'.

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Doug A Roberts​

Unticking 'Enable guides for 9-slice scaling' doesn't work.

[Doug A Roberts]

Are you sure? Because that's all I did on the file you uploaded.

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It's working now!