[Proj] Strange results utm to aeqd projection

[remedius]

I just use cs2cs utility to transform point from utm to aeqd projection. Proj version is 4.4.9.

I have the following command line:
+proj=utm +zone=15 +ellps=GRS80 +units=m +to +proj=aeqd +lat_0=-80 +lon_0=-100 +x_0=0 +y_0=0 +ellps=GRS80 +units=m
and  try to transform (484236, 5006526) point.
The result is (631024, 6129620). I suppose It's wrong.

Then I try  to transform point (631024, 6129620) with the same command line but with -I flag.  The result is (329673, -2729005). It's  all right.

Please, any suggestions?
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