We are facing the mobile drop-down issue when click on link which has sub categories,s only some links are opening and some link s are not working,only three parents are workings as dropdown but remaining are not working.What is the solution for this.
It's probably theme specific bug. I would suggest you to write Porto Theme support about that issue.
Its better to post your question into Porto theme support. You have used porto theme and issue arise in porto theme so no one can be resolved issue without knowing actual code of your Porto theme.
Porto themes gives support for own theme and its also helpful for porto theme to solve its default bug.