I'm trying to draw a hysteresis loop chart in Excel 2003, and even though I
split data in several series X-axis becomes some sort of data numbers.

If I try less than 3500 data, it appears as a hysteresis loop, but if it is
more than that, the graph converts x-axis as data numbers. (it appears
similar to Sine curve).

How can I draw a hysteresis loop with largen numbers of data?