x2tics do not align with xtics

I have a data-set of 480 data points. 

Gnuplot automatically sets the xrange to 500, 
with xtics in 50 intervals. 

Next I explicitly set x2tics
   set x2tics ("A" 100,"B" 200,"C" 300,"D" 400,"E" 480)

When I plot the data the x2tics do not align with the xtics. 
The A,B,C,... labels get their own tics at 103,206,...
The xtics at the lower x-axis are repeated at the upper x-axis.

This is especially obvious when grid is set. 

Once I explicitly set xrange [0:500] the x2tics align perfectly. 

I am using Version 4.2 patchlevel 4. 

Is this a bug or am I using x2tics incorrectly?

Regards, 
Clare
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