strange behaviour in gawk 3.1.4

[Chris Pearson]

Using the attached input in.txt to the attached source bug.awk,
occationally the 8th field is combined to the 7th, with the FS inbetween,
reporting only 7 fields instead of 8.  The lines and amount of them which
do this change if I shuffle the order of input, ranging from 5 to 15
lines.

My GAWK 3.1.4 is linked against the following libraries:

libdl.so.1.8.10
libm-2.0.4.so
libc-2.0.4.so
ld-2.0.4.so

in.txt
Description: Text document

bug.awk
Description: Text document