Start date dont get update after precedecesor activity has been added

Hi , excelent tool you have made

Im stuck on this , its very simple i think. Let say that i have two activities 1 and 2, the second activity must start after the first activity finish. At first both activities have the same start date, then when I add activity 1 as predecesor of activity 2 , what happens is that activity 2 get updated but only end date but the start date remains unchanged. I've performed the same case in PROJEQTOR online demo and it works as espected but local installation does not. In online demo when relate activity 2 has sucesor of activity 1 , the activity 2 has to be moved in gantt view to start after activity 1



thanks for any IDEAS , is it a bug or config missing


best regards
German