quick css/html display problems

quick css/html display problems

I'm building a WordPress basic site and I'm having a bit of a weird
display problem where no matter what i do, when hitting "return" on the
visual editor, or manually entering "&nbsp;" or "<br/>" in the html tab,
isn't creating any space between content. If you look at this test page
here that i made to show what i mean, theres this long runoff sentence.
The code that has this looks like this
this is sentence one<br>
this is sentence two <br/><br/>
this is sentence three &nbsp;
this is sentence four &nbsp;&nbsp;
which should appear like so
this is sentence one
this is sentence two
this is sentence three
this is sentence four
but when seen on WP front end, it shows like a long sentence.
http://tightlineinternetmarketing.com/mike-dev/thp2/?page_id=1930
If i manually go in and enter a bunch of &nbsp; it creates sort of like a
big space between words, not sentences.
The website has a basic/simple cssReset that i always use. The main css is
normal as well. Just to be thorough, I've checked the code in the W3C
validator and aside from 3 errors the menu plugin has, the rest is 100%.
To test, i disabled the menu by commenting out that php code and the W3C
returns 100% green.
I also checked the CSS and it too is 100% good/green.
ive gone line by line and i don't see anything that would make this
happen. Im sure im probably missing something. Maybe need a new pair of
eyes on this.
Any suggestions? thanks in advanced.