Appreciate A Pair Of Eyes

OK I’m having some problem with my blog https://www.abcwritersnetwork.co.uk If you take a look at the home page, every thing appears as it should. A little tidying up to do but basically I’ve got it running.

Take a look, however, at one of the inside posts and note that the sidebar jumps way up the page, it doesn’t do it on the home page.

Any suggestions as to what could be causing this. I’m assuming it has something to do with the style sheet but what I just can’t see.

I am using the Thesis template

Many thanks
Kevin