WPF Chart - 2 Charts Problem DEBUG,RELEASE

Hello, in my application I got 2 Charts that are loaded by a DataContext.
The problem is that i got differences between DEBUG and RELEASE.
During the DEBUG (with SharpDevelop) the 1st one is working fine and the 2nd one working not really good (old values remains on the graph).
 
During the RELEASE (Exe file is run) the 1st one is not working (No graph is shown) and the 2nd one working fine (the problem of before disappear).
How could be possible?
Is there something that i can check on the project?
I want to clarify that no exception appears in both cases.