# Filling -> Axis leaves a gap

Filling leaves a gap between the function curve and the axis

Show[Plot[PDF[NormalDistribution[0, 1], z], {z, -3, 6}],
Plot[PDF[NormalDistribution[0, 1], z], {z, c=1.4, 6}, Filling -> Axis]
]


But for other values (e.g., c=0.5 instead of c=1.4 in the above code), the Filling is correct. Is this a bug or am I making some subtle error?