Hello Kerem,
This happens because you already loaded the TeeChart packages with the chart on the form and, calling LoadPackage, you are loading the same packages twice.
Setting "Build with runtime packages" that should make the LoadPackage call to skip reloading the packages that are already loaded.
Read this:
edn.embarcadero.com/article/27178
An alternative to the design time chart would be to create your it at runtime, after loading the package.