Very different Graphs on a Node and the Master

[welkin]

I have a problem with distributed monitoring and graphs.

Here is the same graph shown from the Node which monitors it and the Master Node. Note: These items can only have two different values 1 and 0, indicating the status of two air conditioners.
Both zabbix servers are at ver. 1.6.4

thanks in advance
welkin

[welkin]

noone has ever seen this problem??

[webdisk]

Graph Difference/Discrepancy in master and child node

I have simliar problem.

http://www.zabbix.com/forum/showthread.php?t=12757&highlight=strange