it's because it doesn't exist in xregistory which confuses the system and makes it scroll all the way to the last icon (the rightmost one in the initial tests i made) because it tries to seek an ID that doesn't exist.

i toyed with new categories (main XMB, not ingame one) and managed to make one that doesn't scroll like hell, but it froze the console as soon as the new category was highlighted
(propably because i duplicated an existing ID and forgot to change some linked values which made it try to access 2 menus at once)

the ingame_xmb also has it's own set of clock values i think.
if you attempt to build a clockmod similar to mine, it's in system_plugin.rco

Plane name="busy_icon_shadow"
Plane name="busy_icon_anim1"
Plane name="busy_icon"
Plane name="busy_short"
Plane name="busy_long"

are what defines the analog clock location.
however, do not touch the posX="", posY="" and posZ="" values of the clock hands.
they are parent relative to tex_busy.gim so their center position is always 0,0,0

the main XMB digital clock values are in xmb_plugin_normal.rco and within it there's also the background panel of the digital clock.