It's common for hard-wired cameras and remote cameras to not be exactly synced up. This is due to the nature of their individual workflows; wireless signals generally travel slower than directly connected signals.
To resolve this, Studio has a simple setting to sync all your camera sources together.
Click the gearwheel in the upper right corner of Studio, then click the Advanced tab.
Navigate to the Remote Inputs Synchronization setting and select Delay All Inputs by 1 Second and Synchronize. This will allow your wired inputs to compensate for the latency experienced by wireless sources (in this case, Mevo) and sync them together.
If you are only using remote camera sources, then select Delay Remote Camera Inputs by 1 Second and Synchronize.
Be sure to save your settings.