Cutting time in advance

[ipprivada]

As the title says the graph shows me filtering well for the last half hour but if a cut occurs this same graph it an hour later. I already checked system time debian, php, mysql, apache and are all correct, something else to check? sorry for my English.

[paulgevers]

Can you add a screen shot? I have no idea what you mean. Also, what version of Debian and Cacti are you running?