Error on form submit

When form is submitted it shows error instead of success message but submission in successfully stored in database.

Erorr : {“email”:”success”,”mailchimp”:”Inactive”,”convertkit”:”Inactive”,”drip”:”Inactive”,”activeCampaign”:”Inactive”,”campaignMonitor”:”Inactive”,”getResponse”:”Inactive”,”aweber”:”Inactive”,”markethero”:”Inactive”,”SendinBlue”:”Inactive”,”MailPoet”:”Inactive”,”ConstantContact”:”Inactive”,”WebHook”:”Inactive”,”MailRelay”:”Inactive”,”Zapier”:”Inactive”,”database”:5336}