rqt_plot not plotting negative time

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Hi, I'm trying to plot some pose data with rqt_plot coming from a rosbag. If I open the bag with rqt_bag I can see that the data as text, I can see the time, the sequence and the values of the poses (pos x,y,z, orient w, x,y,z).

When I try to plot them with rqt_plot, it can see the topic but when I try to plot the pose x for instance, it shows nothing even if the plot is automatically scaling something. And also the time axis is strangely negative... I tried different settings clicking on the gear but nothing changed