Weird Send in Time Problem???

[Dave]

Hi,

I have a test stack with one button and one field, the Button Script  
contains:

on TImer
put the seconds & cr after field 1
put the openStacks & cr & cr after field 1
set the scroll of field 1 to 9999999

send "Timer" to me in 1 second
end Timer


on mouseUp
put empty into field 1

  send "Timer" to me in 2 seconds
end mouseUp

When I look at the result in field 1, I see

1222946339
<<Stack List>>>

1222946339
<<Stack List>>>

1222946339
<<Stack List>>>

1222946340
<<Stack List>>>


How can the seconds property be the same 3 times in a row, when there  
is a one second interval between message Sends???? Other stacks are  
doing stuff, so I can see that there might be a >1 second interval,  
but not <=!

All the Best
Dave