Large gaps on page. from ?

Hi,

On two of my pages I have large gaps. I’m really muddling my way through this so I know i’ve probably done something weird in trying to get my formatting right.

Please have a look at:
https://www.sparkfiredance.com/about/

and

https://www.sparkfiredance.com/corporate-party-entertainment-video-gallery/

Could anyone point me in the right direction?

Thanks