gseGO and KEGG results table not shown in browser

[sdwien]

When I executed ClusterProfShinyGSEA with the example Drosophila dataset, the gseGO and gseKEGG tabular results were not shown in the browser. They were generated, though, because when I download the results from "save results as CSV file", there they are.
There are also some DataTables warnings:
DataTables warning: table id=DataTables_Table_4 - Invalid JSON response. For more information about this error, please see http://datatables.net/tn/1
DataTables warning: table id=DataTables_Table_5 - Invalid JSON response. For more information about this error, please see http://datatables.net/tn/1
DataTables warning: table id=DataTables_Table_6 - Invalid JSON response. For more information about this error, please see http://datatables.net/tn/1

For KEGG results table, there is an additional red warning box saying:

Output warning:

'select()' returned 1:many mapping between keys and columns

Warning in bitr(names(original_gene_list), fromType = input$keytype, toType = "ENTREZID", :

22.08% of input gene IDs are fail to map...

Plots are generated perfectly fine.

Best,
Sophia