Hi Manas,
We have checked the reported issue “Showing two SfComboBox's dropdown list while clicking toggle dropdown button in SfComboBox” and the issue was not reproduced on our side. We have prepared a sample for your reference and please get it from the attachments.
Please check the sample and if you are still facing the issue, you can return us with more information about the replication steps with the sample. This will help us to further investigate and provide you with a better solution at the earliest possible time.
Regards,
Shivani
Attachment:
ComboBoxSample_49a11cc2.zip