WPCode zombie

Just trying to get into WordPress. Nothing published yet so cannot give a link. Started with one page (“Page1”) which displays a table. I want to perform an action if a user clicks on a particular cell. Wrote some js code in a small HTML test page as proof of concept and then tried to transfer it into WP and this is where I have been stuck for the last three days. I am using a WPCode Shortcode to embed the script and as the first attempt failed, I modified the script, updated the page but have subsequently found (from the page source code) (1) that the contents of the first script have somehow become embedded in the page (deleting the shortcode link does nothing) and (2) all attempts to add further code snippets as shortcode are just ignored (but modifications to the data in the table are fine) – so the page is being updated. I thought this might be a cache problem but WP Super Cache shows there is nothing cached and I have cleared my browser cache. I don’t mind spending time finding how to modify my code to get the effect I’m looking for but at the moment I can’t seem to modify the code and see it in the published page. As this is my first WP attempt I hope I’m not missing a basic function of the package. Any help would be much appreciated.