Inifinite Re-Direction

I'm having an issue where if you go to a slave site it essentially just re-directs endlessly between the master and the slave.

Whats odd is this was working fine until recently, and i haver not done anything to the system related to this.

Here's what my sessions table looks like:

INSERT INTO `sessions` VALUES (0, 've4lpqchracqvvrbefijhpk8s3', '24.68.251.157', 1180374580, 0, 'singlesignon_slave_sessions|a:1:{i:0;s:26:"nn2v1vu470o46lr74squ962un0";}');
//this is the master site's session

INSERT INTO `sessions` VALUES (0, 'nn2v1vu470o46lr74squ962un0', '24.68.251.157', 1180374580, 0, 'singlesignon_prior_sid|s:26:"nn2v1vu470o46lr74squ962un0";');
//this is the slave sites session

INSERT INTO `sessions` VALUES (0, 'hihk26decvq22sibj5viin3a24', '24.68.251.157', 1180374575, 0, 'singlesignon_prior_sid|s:26:"hihk26decvq22sibj5viin3a24";');
//not sure what this one is but i think its related

It seems like its possibly generating a new session every time it gets directed back to the slave site instead of using the old one.

Any ideas what could be causing this?