spumux - highlight/select offset error

Hi
The DVDs I am creating have a very weird offset in the buttons

spu.xml file is

<subpictures>
<stream>
<spu start="00:00:00.00" image="/home/mike/image.png"
select="/home/mike/select.png" highlight="/home/mike/highlight.png"
force="yes"
autooutline="infer"  outlinewidth="2"
autoorder="columns" > <button name="ONE" /><button name="TWO"
/><button name="THREE" /><button name="FOUR" /></spu>
</stream>

INFO: default video format is NTSC
INFO: Picture /home/mike/image.png had 3 colors
INFO: Picture /home/mike/highlight.png had 3 colors
INFO: Picture /home/mike/select.png had 3 colors
INFO: Autodetect 0 = 70x140-323x352
INFO: Autodetect 1 = 70x360-323x572
INFO: Autodetect 2 = 390x140-643x352
INFO: Autodetect 3 = 390x360-643x572
INFO: Pickbuttongroups, success with 1 groups, useimg=1
INFO: Found EOF in .sub file.
INFO: Max_sub_size=4438
INFO: 1 subtitles added, 0 subtitles skipped, stream: 32, offset: 1.00

There is a shadow from previous buttons on all buttons after the first
on highlight/select

I attach a gzip of four pngs to show the effect

menu.mpg ,highlight.png, image.png, select.png are all 720 x568

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