Thanks to OPUS the problem is solved.
Problem:
When altering the configuration of the archive in the cfg-file and using different definition names, or several per item, openhab does not delete sometimes from its internal rrd4j.config file. Letter one is an automatically generated one (on pi:"\OPENHABIANPI\openHAB-share\openhab2-userdata\config\org\openhab\rrd4j.config"). This may contain several or old definitions for the archive for an item. This does cause difference between get and wanted archive size/granularity.
Solution:
Stop openhab. Delete the rrd4j.config file (not rrd4j.cfg!!). Start openhab again. Stop the rrd4j service and delete the archive file (xyz.rrd). Start the rrd4j service again. The problem should be fixed
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