Duplicate Leads are not getting merged

Hi Team,

we are trying to merge duplicate lead. The duplicate rule which has been set up, shows the duplicate and when we try to merge those records. The records id not getting merged. It still ends up displaying the two records and it doesn’t show any error message also.

Create instance being used is 7.18.2

Question : As there is no error message showing up, can we know how can we can merge the records.

Note : We did verify the system settings and Operation permission and all the permissions has been provided

Regards,

Mayan