Hmmm... It could be possible there are multiple instances of the script installed on your computer. Look in the scripts list and see if there are any others called "Chat Counter" or "PSM+" and stop them and then remove them. Also check in the scripts folder.
There was another thread about this with the !open command still working after uninstalling Huhu's script. I think it's down to the script being loaded in memory or something. Correct me if I'm wrong