as soon someone enters an emoji in one of the form fields (text, textarea) the form submit fails:
→ An error prevented the entry for this form submission being saved. Please contact support.
If it is the cause of the issue, you may want to work with your web host to convert the database tables and columns to the utf8mb4 character set and utf8mb4_unicode_ci collation. You’ll want to create a full database backup before undertaking a change like that.