Contribution Page Confirmation Emails
Can you check if you have turned on send receipt? You can check by navigation to CiviCRM >> Contributions >> Manage Contribution Pages

Click on Configure link besides the contribution page and then 'Thankyou and receipting'

Once you on receipt page scroll down and check the box 'Email Receipt to Contributor?' if its turned off.

Also check under 'Profiles' tab if you have included correct profile.