I am working on the hr leave odoo 12, xlsx report by department , I have overwrite problem when print xlsx report for more than one department - odoo

Question

I am working on the hr leave odoo 12, xlsx report by department , I have overwrite problem when print xlsx report for more than one department.
here is my code:
############################### for department #########################################
def get_all_date(self, data, empid):
domain = [('state', '=', 'validate'), ('employee_id', '=', empid)]
if data.get('date_from'):
domain.append(('date_from', '>=', data.get('date_from')))
if data.get('date_to'):
domain.append(('date_from', '<=', data.get('date_to')))
print(domain)
leave = self.env['hr.leave'].search(domain)
return leave
def generate_xlsx_report(self, workbook, data, record):
##################### for department ########
res = []
Employee = self.env['hr.employee']
if 'depts' in data:
for department in self.env['hr.department'].browse(data['depts']):
res.append(
{
'dept': department.name,
'data': []
}
)
for emp in Employee.search([('department_id', '=', department.id)]):
res[len(res) - 1]['data'].append(
{
# 'emp': emp.name,
'display': self.get_all_date(data['data'], emp.id)
}
)
sheet = workbook.add_worksheet('Leaves Report')
bold = workbook.add_format({'bold': True, 'align': 'center', 'bg_color': '#fffbed', 'border': True})
format = workbook.add_format({'num_format': 'd-m-yyyy'})
header_row_style = workbook.add_format({'bold': True, 'align': 'center', 'border': True})
format2 = workbook.add_format({'font_size': 10, 'bold': True, 'align': 'center', })
title = workbook.add_format(
{'bold': True, 'align': 'center', 'font_size': 20, 'bg_color': '#f2eee4', 'border': True})
sheet.merge_range('A1:E1', 'Leaves Summary Report', title)
# Header row
# Header row
sheet.set_column(0, 4, 18)
sheet.write(2, 0, 'Department', header_row_style)
sheet.write(3, 1, 'Employee', header_row_style)
sheet.write(3, 2, ' Start date', header_row_style)
sheet.write(3, 3, 'End date', header_row_style)
sheet.write(3, 4, 'Leave Type', header_row_style)
######################### for department #############################
for rows, i in enumerate(res):
print(i)
col=0
sheet.write(rows + 4, col, i['dept'], format2)
#rows+1
for j in i['data']:
print(j)
for rows ,k in enumerate(j['display']):
print(k)
# sheet.write(ro + 3, col, k.department_id.name, format2)
sheet.write(rows + 4, col + 1, k.employee_id.name, format2)
sheet.write(rows + 4, col + 2, k.date_from, format)
sheet.write(rows+ 4, col + 3, k.date_to, format)
sheet.write(rows + 4, col + 4, k.holiday_status_id.name, format2)
rows+ 1