fix

src/app/mapping/mapping.component.ts

@@ -70,7 +70,7 @@ export class MappingComponent implements OnInit {
       this.dataSetService.getLocally('./assets/distribution.json').subscribe(
         (distributions: Distribution[]) => {
           this.distributions = this.ontology === "dcat" ? distributions.filter(d => !d.geodcat) : distributions;
-          this.vocabularies = this.vocabularies.concat(this.distributions);
+          this.vocabularies = this.vocabularies.concat(this.ontology === "dcat" ? distributions.filter(d => !d.geodcat) : distributions);
           this.distributionSelectedPaths = [];
         }
       )