I'm using waystones in the RLCraft modpack and despite having a set spawnpoint, using a waystone removes the spawnpoint every time. whether i die, or use a recall potion, if ive used a waystone after sleeping, the spawnpoint is removed and i spawn in a random area

RLCraft has "Set Spawnpoint on Activation" enabled, which should cause you to spawn near (or at) the waypoint. You can disable it in the waystones configuration.