Hi! I have been developing a game set in space (more details on that later 
), and have found a weird thing happening with it: when server (I am using listen-server) moves around, bumps into clients, and so forth, everything works perfectly in both clients and servers vision. But when client moves around and bumps to server, nothing happens, as clients seem to not replicate over the network. What should I o?
The server is what replicates to clients. Clients never replicate anything. You can call RPCs from a client to the server. I imagine you are having an issue with your input not being sent to the server in some fashion.
Yep, the server does everything that is replicated.
So if your Client bumps into the server or another client, the server will do the replicating stuff.
Your “bumps” sounds like you want to replicate physics?
yes, that is correct 
How should I go about fixing this?