LoopTool doesn't sync correctly

When using LoopTool, it doesn't appear to sync correctly, starting "one in" on the second list, and also missing the last value from the second list.

Running the example from the documentation, without the stop():

#set( $list = [1..7] )
#set( $others = [3..10] )
#foreach( $item in $loop.watch($list).sync($others, 'other') )
$item -> $loop.other
#end

produces:
1 -> 4
2 -> 5
3 -> 6
4 -> 7
5 -> 8
6 -> 9
7 -> $loop.other