Hi Patrick,
Thanks for contacting Syncfusion support.
On further analysis of the shared screenshot, the mentioned problem occurred in “ej.web.all.min.js” script file when initializing dropdown parameter at your end. We have tested the shared Report with current source and it’s working properly at our end. So can you please share the “ej.web.all.min.js” script file referred in your application to validate the mentioned issue at our end.
For your reference, we have prepared a sample and it can be downloaded from below location,
Regards,
Yuvaraj D.