When Myth is active for live TV it creates files. LMCE's utility to capture Myth's recordings is not very smart and can add those to the list. And again through the UPNP server in Myth as well. so they can show multiple times. The script needs improvement-
1) add when the program starts, not when its finished
2) Add the full complement of data (images titles etc.)
3) Not add the recordings that were not intended to be recorded.
When you see the listing in "video" click on it and look at the file name. That may tell you where its stored (or thinks its stored). removing the file won't necessarily remove it from the list. You may need to resync the listings.