2x DHCP hosts - slighty different results with trace route

I have 2x PC that are getting 2 different results with traceroute out the VPN.

Path: PC -> Switch (L3 gateway) -> FW -> (VPN) -> .....

Now the gateway of the switch is the FW, not the best setup, babysteps. However, I'm hitting the switch as first hop, he is not. What could be causing this behavior, we both have the same GW configured.

Essentially the both reach the destination, but I'm hoping this isn't a bomb waiting to explode.

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TL;DR - 2x PCs pulling DHCP connected to the same switch, using TraceRT - only 1 shows the switch (Default gateway L3) as a hop.