Why isn't my ground plane in Kicad connecting all of my grounds?
The LT3045 requires that the pad beneath it be grounded so add this as a pin to your circuit and show it connecting to ground. Then pins 9 and 11 can be routed to the pad beneath the chip and make a ground connection easily: -



You should also re-position C1 to make its 0 V connection much stronger and less disruptive (I also believe this should be close to the chip and not strung out where it is). If you were prepared to route tracks under R2 then you wouldn't need the single track on the other layer. Better still, make that other layer a full ground plane.