Data Sources changing randomly. Bug?

[kwaH]

Hi,

after reading some posts from Lux (thanks for the infos!) I managed to create a graph template which I want to use to sum up the in- and out-traffic from two interfaces of two different routers.

There are four DS in total (router 1 - in, router 1 -out, router 2 - in, router 2 - out) which I can select from a pulldown menu when adding the graph.

However after I save the graph and look again at the details, I see that the data sources have changed. Instead of

router 1 - in
router 2 - in
router 1 - out
router 2 - out

in the "Graph Item Fields" part of graphs.php?action=graph_edit I get

router 1 - in
router 1 - in
router 1 - out
router 1 - out

or

router 2 - in
router 2 - in
router 2 - out
router 2 - out

Strange enough the source of the graph makes no sense to me either:

/usr/local/bin/rrdtool graph - \
[...]
DEF:a="/path/to/rra/router1_traffic_in_374.rrd":traffic_in:AVERAGE \
DEF:b="/path/to/rra/router1_traffic_in_374.rrd":traffic_out:AVERAGE \
[...]

The data source router2_traffic_in_xxx.rrd is not showing up?

Am I doing something wrong or is this a bug?

Cheers,

kwaH