An A319 Captain reported inaccurate weight and balance calculations produced by the CLP (Central Load Planning) computer.

Narrative

The flight plan for our flight indicated a ZFW of 115.0 When my First Officer requested the runway performance data it indicated a ZFW of 105.2 It is not unusual to have a small change in ZFW between the flight plan and runway data. However; a nearly 10;000 LB difference was significant and did not make sense considering the flight had been planned full and the passenger load had not dropped off. We requested another flight plan and runway data. Both were the same as the original documents. We called the Central Load Planning (CLP) Desk working our flight and reported the error. He said they were having some problems with the system and that it was having some 'glitches.' He made some manual inputs and said to try again with the runway data. This time we got runway data that indicated 114.0; a more reasonable number with regards to our flight plan and passenger load. If the CLP System is having problems this needs to be rectified immediately. Our pre-flight procedures and checks caught the error. A 10;000 LB error on the low side would have resulted in incorrect V-speeds being set on the MCDU Performance page. This error would have resulted in V1/Vr speeds that were approximately 5-6 KTS low. Not safe.