cbc-pillowfight Timings option (-T) doesn't report latenecies in the range 1000us to 1999us

The "--timings" or "-T" option for cbc-pillowfight will show latencies, but it's always seeming to leave out latencies in the range 1000ns - 1999ns. Here's an example:
...
[980 - 989 ]us | - 1
[990 - 999 ]us | - 1
[2000 - 2099]us | - 21
[2100 - 2199]us | - 28
...
Here's an example command line giving this result:
$ cbc-pillowfight -U couchbase://localhost/usertable -v -T -B 10 -I 1000000 -p f -t 5 -r 50 -n -m 1024 -M 1024 -c 100000