Thank you for the provided information. However from the screenshots it seems that the data is very different since the bars have different values. Furthermore we do not know what your implementation is and we are not able to reproduce the issue at our end. Please have in mind that you might be using different versions of Telerik Reporting on the machines or the config file may have some parameters set for the PDF export. Therefore we will need some additional information about the project.
Please also note that if you are using the old Chart item it will be best if you start using the new Graph
item, since the Chart is now obsolete and will not be developed in the future. You can upgrade your report to use the Graph item and check if the issue persists.
Have you tried the new visualization options in Telerik Reporting Q2 2013? You can get them from your account.