serverSideDataSource triggering twice in ag-grid

serverSideDataSource triggering twice in ag-grid, When the filter set on session and reloading the window. The below method triggering twice

 serverSideDataSource(count: number) {
        return {
          getRows: (params) => {
            //add sortModel for dynamically created columns
            params.request.sortModel.forEach((sortItem) => {
              if (sortItem.colId.split('&').length > 1) {
                const sortModelObj = {};
                sortItem.colId.split('&').forEach((subCol) => (sortModelObj[subCol] = { ...sortItem, colId: subCol }));
                params.request.sortModel = Object.values(sortModelObj);
              }
            });
            const sortModel = Object.keys(params.request.sortModel);
            let where = this.whereBy;
            if (this.filterStateWhere.length !== 0) {
              where = [...this.whereBy, ...this.filterStateWhere];
              const mainFilterModel = this.gridApi.getFilterModel();
              const filterStateModel = JSON.parse(this.cacheSvc.getState('session', `${this.viewType}/${'FilterState'}`));
              params.request.filterModel = { ...mainFilterModel, ...filterStateModel };
            }
            const filterModel = Object.keys(params.request.filterModel) as string[];
            this.payload = getDefaultPayload({
              params,
              gridOptions: this.gridOptions,
              order: this.orderBy,
              where,
              select: this.selectBy
            });
            this.payload.limit = this.gridOptions.paginationPageSize;
            // main server request
            if (filterModel.length !== 0) {
              this.filterChecks(params, filterModel, sortModel);
            } else {
              if (sortModel.length !== 0) {
                this.payload.offset = this.gridApi.paginationGetCurrentPage() > 0 ? params.request.startRow : 0;
                this.payload = this.applySortPayload(params.request.sortModel);
              }
              this.togglePagination(count);
              this.fetchItemsRequest(params, count);
            }
          }
        };
      }