Site name doubling in browser top bar

Hi, when you visit my site http://powvets.com the top browser bar (right at the top) shows my site name twice IE:

Gallery | PowvetsPowvets

I have investigated this and it is coming from the Settings – General settings – site title input.

If I remove the site title from this input I get Gallery | –

Same behavior in IE and Firefox

Can you tell me how to fix this please?

Thanks,

Wayne