Hi @Sarah327 - I don't see the exact screen you show above. But I think you might have to edit your check-in instructions to match the check-in time you set elsewhere.
Look at your set check-in time. Go to the listing, then "Booking settings," and scroll down to "Check-in & checkout":
Then go to your listing, choose "Listing" at the top, and scroll down to "Check-in instructions":
Click through, touch the three little dots at the top right, and select "Edit Check-in Method":
You've chosen "Lockbox." You'll be able to "Edit Details" under Lockbox on that page. That's where you can check that your details match the check-in time you've chosen.