sdiff version 2.8.1 - compares the wrong line

[minimoa]

sdiff -s (version 2.8.1) does not recognize inserted line in following 
example:

old file:
epsxe 1.5.2
esound-devel 0.2.29
esound 0.2.29
estic 1.60

new file:
epsxe 1.5.2
eric 3.2
esound-devel 0.2.32
esound 0.2.32
estic 1.60

sdiff -s old new    gives this output:
esound-devel 0.2.29    |   eric 3.2
esound 0.2.29              |   esound-devel 0.2.32
estic 1.60                     |    esound 0.2.32
                                    >   estic 1.60

however, it should say:
                                    >  eric 3.2
esound-devel 0.2.2     |   esound-devel 0.2.32
esound 0.2.29             |   esound 0.2.32