Hi,

I am trying to replicate your problem. I put a trend line on a 60 minute chart. the starting and stopping prices and times were noted. I changed to a 240-minute chart. the starting and stopping times and the price points were the same. Of course the trend line did not look like the previous one since the price data between these points was now organized differently, in a 240-minute bars, rather than 60-minute bars. I changed to 15 minutes; same trend line, different bars. I changed back to 60 minutes, and the chart returned to exactly where it was where I began, and the trend line was identical.

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Trendlines have two points...each identified by a datetime and a price.  When dropping down a tline on a 240m chart, it will attach itself to the ending times of those 240 min bars (and the respective prices).  Commonly you'll put it on a high or low.   If you then switch to 60-min chart, it will use the same price...but it will pin itself to the 60-min bar that matches the datetimestamp...which would be the last 60 min bar within the 240min bar.  For this reason, it's always best to originally drop the trendline on the lower periodiicty first, then it will retain proper position among periodicities much better.

However, this may not address his issue at all.  It may be that you have the trendline set to "attach to high/low". Is this the case?

I would recommend you turn that setting off, as that setting WILL cause a trend line to change position as you change periodicities.