GNWL meaning
GNWL usually refers to General Wait List and is commonly seen for passengers booking from or near a train's source-side quota. Confirmation depends on cancellations and quota rules.
RLWL meaning
RLWL means Remote Location Wait List. It is usually linked to intermediate stations and can move differently from GNWL because its quota is separate.
What to do next
Do not judge only by the waitlist type. Check the PNR passenger-wise, watch movement, and subscribe for alerts if the ticket is still WL or RAC.