[Ntop] graph problem

[Manuel Calavera]

I got graphs like the one I have attached.
I'm using CentOS 5.1, rrdtool 1.2.23, ntop 3.3.
I have not compile rrd and ntop, but I'm using packages download from
rpmforge.
http://dag.wieers.com/rpm/packages/rrdtool/
http://dag.wieers.com/rpm/packages/ntop/

I tried ntop 3.2 and rrdtool 1.2.18, I also rebuild rrdtool startring from
src.rpm but I've got the same problem.

Any idea?

Thanks in advance.
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