Product reference number moves down 1 line if too long

[swimmingpoolguru]

Any ideas how to keep my product reference number from shifting to the next line under my price? When I have a shorter reference number everything looks good but the longer ones seem to shift to the next line and I would like them all on one line?

See example.

http://www.swimmingpoolguru.com/95-aquabot-turbo-robotic-pool-cleaner.html

In this example the reference number has jumped down 1 line. I would like to keep them in line with the text.