[Gpsbabel-misc] gpsbabel dropping points when it shouldn't

hi. i seem to have encountered a weird case of gpsbabel dropping more 
trace points when trying to simplify the trace.

gpsbabel options :

gpsbabel -i gpx -f infile.gpx -x position,distance=2m -o gpx -F outfile.gpx

my understanding is that it should remove points that are closer than 2 
metres to the previous point. i have attached a reduced testcase. if 
that command is used on it, on the lower part of the trace there are 
several cases when way more points are removed - in one case more like 
up to 40 metres.

i have tested with gpsbabel 1.3.6 and 1.4.2, the problem seems to be 
there with both of these versions.

if i reduce the trace to only the part that gets broken, it is processed 
as expected - no excess point dropping.
-- 
   Rich