What you see in the relationships graph are table occurrences, not tables. They can be named whatever you like. To see the underlying table and its file, double-click the TO - or hover over the dot in the upper left corner.
Ahhh thanks i have seen the tables in the TO line and didnt know they were what they were lol, I assumed the others were tables as they are related and the fields in them appear in the layouts.
Another clue is to look at the list of "occurrences" in the list next to the underlying TableName.