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Xamdatachart Marker disappears

I have the problem, that in a XamDtachart one of my custom Markers disappears, when I switched between the tabs. It doesnt matter to witch Tab, its always the same DataPoint that looses his Marker. I do nothing with the data in one of the other Tabs. The marker wont show up till a restart of the program.

Anyone else had this problem and found a solution?
Sadly I have too much data from sql, so I cant create a standalone version.