Question: nconsistency in starting the branches from x=0

hi every one.

in the attached maple file at line x=o in the plotted figure we have some inconsistency in starting the branches from x=0 and the branches do not start from the same value on this axis.

I can not find the problem because there are not any differences between phi 1 and phi 2! 

evalf(f1 - f2)= -5* 10 ^-49

h-x_nemodar-e.mw

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