I am trying to unwrap the UVs on this object and have marked the seems so there should be 4 islands, however once I click the "unwrap" button Blender seems to make several extra islands, some of which are only one face. I have checked to make sure there is no non-manifold geometry and there is none.
If it matters, I have been 3D modelling for a few years but have only recently picked up Blender. I am more used to unwrapping in Maya but would like to learn Blender. I have tried googling for this issue and have only found tutorials on UV unwrapping, none of which address this specific issue.
Attached is a picture of the model with transparency on so you can see the marked seems, and then a picture of the UVs made after clicking unwrap, I spread them out a bit just so you can see how many small ones there are.
Thanks in advance.