I can only "see" about half of the computer VPN?

[Jonathan_Pitts]

Layer2 extends one subnet to multiple locations, which includes broadcast traffic.
Layer3 routes, each location will have it’s own ip range.

See these great articles.

Setting up a Layer 2 PepVPN Profile in Firmware 6.2 Onwards

Introduction Since Firmware 6.2, we have redesigned the Layer 2 PepVPN feature. It is now easier to use and more flexible, allowing it to fit into more use cases. However, to achieve this, the new Layer 2 PepVPN feature is not compatible with existing Layer 2 PepVPN profiles created using firmware 6.1 or below. After upgrading to Firmware 6.2, all existing Layer 2 PepVPN profiles will become normal Layer 3 profiles. In order to reconfigure them back into Layer 2 profiles, please follow these ste…

Layer 2 VPN vs Layer 3 VPN

After the Layer 2 SpeedFusion was established, both of the Peplink devices will act as Layer 2 switches. Communication for Layer 3 and above will control by other devices. This is what I mean. Layer 2 or 3 having the same reliability. Since multicast is needed in your deployment, Layer 2 SpeedFusion will be more suitable.