As always - operator error.
You have wrong settings. You actually have 1-minute data in your DATABASE but you have selected wrong "base time interval"
The setting in File->Database Settings does NOT change actual data. It is just a selector for telling the PLUGINS
what interval to ask from external source. If in your database you ALREADY HAVE 1-minute data, you should
set File->Database Settings, "Base time interval" to 1-minute. This is so because "Base time interval" MUST MATCH ACTUAL DATA that you have. This should be set ONCE per database and never changed.
For changing VIEWING interval use View-> menu.