Do you have NiXiLL's Scale Spawns? Disable it.
Are you using the Team Spawn Points in the SpaceMods tab rather than the normal Spawn Point?
Have you changed the team colours? People could be appearing to spawn as "Red in the Blue base" because you haven't changed the uniform/team colour of the second team to blue.
Rich231, what are you talking about? The ifTeam event comes with Team Deathmatch if Variable Events is on, but has nothing to do with respawning.