While you are creating the code from twitter, If you have entered any url it will share that page content and url every time.
So the solution is just need to avoid the url option while your using twitter share button code , It will read the content from the current page and share current url.
Normally all the social share button using og meta data
so set the og data properly some thing like
<meta name="description" content="meta description" />
<meta name="keywords" content="your page keywords" />
<meta name="og:title" content="Your page title nique" />
<meta name="og:type" content="type of content" />
<meta name="og:description" content="Description this will share on social media as a contnet." />
<meta name="og:url" content="http://www.walkswithme.net/smart-image-zoom-plugin-with-jquery" />
hope its make sense..