Wrong faces being seperated from one another after unwrap Some faces that are connected through 'unseemed' edges still separate from the rest of the island when I use unwrap

If you look at the attacked image, the left most edge of the selected face was not set to have a seem so it should be connected to the rest of the island. But if you look at the UV window on the left you can see it was unwrapped as a single island off in the corner. 

Does anyone know why this is happening?

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Under UV mapping/Smart UV project/ Change the angle limit to something like 40 and run it again. Or a value like 80