Hashtable returns value for wrong key

Question

I have a Hashtable<String, Hashtable<String, String>> where I want to get the hashtable with a key, but it returns the value for the other key. Here is the code:

Hashtable<String, Hashtable<String, String>> testFormProperties = 
         formProperties.getFormProperties();

Hashtable<String, String> treeProps = 
        (Hashtable<String, String>)testFormProperties.get("clusterTreeItem");

now treeProps contains

freeTextLabel= {
     guiType=TreeItem, 
     label=freeText, 
     path=/data[at0001]/items[openEHR-EHR-CLUSTER.cluster_test_data_types.v1]/items[at0001]
}

instead of

clusterTreeItem={
    guiType=TreeItem,
    label=freeText, 
    path=/data[at0001]/items[openEHR-EHR-CLUSTER.cluster_test_data_types.v1]/items[at0001]
}

here the content of the testFormProperties Hashtable as per debugger:

{
   freeTextLabel =
     {guiType=TreeItem, label=freeText, path=/data[at0001]/items[openEHR-EHR-CLUSTER.cluster_test_data_types.v1]/items[at0001]
     }, 
  clusterTreeItem = 
     {guiType=TreeItem, label=freeText, path=/data[at0001]/items[openEHR-EHR-CLUSTER.cluster_test_data_types.v1]/items[at0001]
     }
}

I got the same results with Properties<String, Hashtable<String, String>

Can someone explain what is wrong and why?