Question: A curve disappear when modifying a plot view.

Hello everyone!

Please help me with this issue.
I have a plot with three curves and when I do any modification to the view (zoom in/out, pan) one of those curves disappears.

This is the plot before the modification of the view:


And this is the plot after the modification: (I just selected the "pan" option and clicked the plot)


What can I do to keep in view all the curves?
Thanks.

SDFS_primer_intento.mw

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