[amibroker] Why do signals change after the bar closes?

["professor77747" <professor@xxxxxxxxxxxxxx>]

I have trading periods that last one minute. They open 1 minute 
before the bar closes. I have arrows appear on my charts when my 
conditions indicate a buy or sell. When my trading period is open, I 
also get trading signals that disappear when the trading period 
closes.


I was watching my charts when the trading period opened. I had a sell 
signal, but I already had a short position so nothing happened. The 
trading period closed. I watched for about 5 more minutes, but the 
new bar didn't appear. The sell signal arrow was still there. Then, 
later in the day, I checked my charts and the new bar had appeared. 
However, on the old previous bar, there was a buy arrow instead of a 
sell arrow. Why could that happen if the bar should have been closed.
 
I use hourly data with the day/night chart. My charts show new bars 
at 4:30am 4:30pm and midnight. Does that mean that the 4:30 bars 
don't close until 5? I have watched for new bars and have noticed 
that sometimes they appear quickly and at other times they don't 
appear for awhile. I thought that they didn't appear until a trade 
was made. I have closed my AB and reopened it and the bars would 
appear when the backfill was complete.  

The only indicators that I use in my conditions are the MacD and the 
Stochastic. 

The question is when do the bars close so that I know that the charts 
have the correct final signal? Also, why do my signals change after 
the bar has closed?




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