**BUG**
I believe the standard MOSFET libraries are incorrect.
If you place a P or N Channel MOSFET on a schematic, set the package to SOT-23 or WSOT-23 the resulting PCB footprints are incorrect and the source and gate are reversed.
All the SOT23 MOSFETS I have used follow the same layout eg look at the datasheet for a 2N7002 or an SI2301DS or a SI2302DS all of which are really common.
I have created my own MOSFET parts to work around the problem for now.