GitHub

Datatable sortable header Icon is displayed as T on load

We are using datatable in our application with sortable header feature.But when the screen loads the icon is getting displayed as T. Please find the attached.
GitHub

Multiple columns in group row header in ngx-datatable angular6

<ngx-datatable [rows]="data" [loadingIndicator]="loadingIndicator" [groupExpansionDefault]="false" [groupRowsBy]="'Route'"> <!-- Header Template --> <ngx-datatable ...