This is not a bug, but rather a feature. The drawings are saved in JCloud by default and linked to the instrument. You can disable this saving, if you untoggle a button in chart toolbar or open Object Manager and move the objects from JCloud to local.
Usually the traders do one technical analysis for each instrument. Saving them in our cloud service is convenient when you use several charts of the same instrument, but different periods. Drawing an object in one chart repeats it on all the others instantly. Many users have asked for this feature. JForex4 has it now.
Besides, this opens the gates for the object synchronization among all our platforms, which we plan to do in the future.
https://www.dukascopy.com/wiki/en/manua ... top/charts