Description states that transfer is possible only on the same orbit but my platforms send asteroid chunks to nauvis orbit while on the go and on any orbit.

Hrm, I'll look into this more. It always was restricted in my test save but I haven't used it heavily in a real save yet.

Can you try turning on the debug messages and making sure platforms say they are entering/exiting orbit properly?

I've had the same bug. I was able to observe the following:

Directed platform to leave orbit, orbit departure is logged.

Load save, change the name of the platform, and direct it to leave orbit. Orbit departure is not logged. I then remove a requestor chest. Logs show "Removed chest on platform <old platform name>."

If you're tracking surfaces by name, try tracking them by index instead, since while surface names are unique, they can be changed. Surface index remains unchanged for the lifetime of the surface.

The index sounds like a good option, since if you change the name of a ship it breaks, if you re-use the same name, it breaks.
BTW, it also crashes when you right click the empty slot of a requester

The mod Orbital Transfer (0.2.3) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event orbital-transfer::on_nth_tick(5)
orbital-transfer/control.lua:237: attempt to index field 'value' (a nil value)
stack traceback:
orbital-transfer/control.lua:237: in function 'get_requested_on_platform'
orbital-transfer/control.lua:297: in function 'process_orbit'
orbital-transfer/control.lua:385: in function <orbital-transfer/control.lua:381>