We examined the screenshots you sent to us. Indeed, when you switch between
the resolutions and go from dayly to weekly to monthly resolution the
trendline touches the same points in all of these resolutions. However, when
you move from month down to week and day the trendline does not touch the
same points on the chart.
However, such behaviour is logical, since the trendline has absolute
coordinates, so its position does not change, while the chart looks
different.
We compared trendlines in MultiCharts with trendlines in TradeStation and
their behaviour turned out to be identical in both programs.
If the software you are using at the moment works in a different way, could
you, please, tell us what software that is. Most probably, trendline in the
software you referred to have a function which enables it to find extreme
points on the chart.
Best regards,