What happens if you copy from your source of codes and paste into Notepad? If every line ends in a space there, the spaces are coming from your code source document or app. If not, do the spaces appear immediately as soon as you paste the list into your product settings, or only after you Submit the edited product settings?
IE uses a different type of Flash player (an ActiveX control) than all other browsers use (a Netscape-style plugin), and Chrome bundles its own version of the Flash plugin rather than using the common OS-level installed plugin that Firefox, Safari, Opera, etc. would use.
The current public version of Chrome is 20.0.1132.57, so perhaps your dev-channel (beta) version 21.0.1180.57 has a bug in its bundled Flash plugin. You may wish to file a bug report with Google about this: