CF5 form shows error message on Thanks page

The CF5 Forms on all my sites have Google No Captcha, and they continue to work well, returning the Thanks page and sending the admin email. However they throw an error message on the Thanks page, so that it appears the message failed: "The reCAPTCHA wasn't entered correctly. Please try it again."
​
I ran a debugger with the following result:
​
DATA ARRAY

Array
(
    [chronoform] => contactcssa
    [event] => submit
    [Name] => Margaret Knox
    [Email] => margknox@optusnet.com.au
    [Message] => Testing contact form on CSSSA site (5)
    [g-recaptcha-response] => 03AGdBq24cVq9AMbz-Y_-fV4mWHnp15vVM1Vex-Ote9Upvn2IJkxwqXuS7_M0uEe5aBp-sQuz3QVUoiqQq94yuzOdde2DoG5DfI9Hm32F57J_x91-sx_jw780yPKdb1Pd-8nKNKX8GsUBz6SDzBRDtq6pFTmIwslCBK-QCBfNhP9Fh9yAHrUh3CJeAsQUbLc8uQ-CX4xqKMUgNWsOv3u5O2ztbY5vkWZU5OgMrjC1pf403FRg490VY1pvrwHUENw7C6hWfwOAQ72UMi7OSzYpfsStx7L_uII6I-lJ0_iq7ifM8mMW4FWaPFut6wcKCtsPqksBmE5CEUKYOTC-p35krCr193xmJWNsgNN-s1whyQHE9fZLTNN1EYOVLfNKaGI2hBu5Y20NlocMnuEuW8Ry9XFTygITZ2dfwbIaQnzxcAfVjqiQj4_bnMeZ95bKlaWrmjd9rFO56VUQp
    [button6] => Submit
    [cf_id] => 7
    [ip_address] => 49.184.169.137
)

​

Array
(
)

ERRORS
​

Array
(
)

​
DEBUG INFO

Array
(
    [16] => Array
        (
            [Check Google NoCaptcha] => Array
                (
                    [0] => 
                )

        )

    [5] => Array
        (
            [DB Save] => Array
                (
                    [Queries] => Array
                        (
                            [0] => INSERT INTO `xl1c8_cf_Contact` (`Name`, `Email`, `Message`, `user_id`, `uniq_id`, `created`) values ('Margaret Knox', 'margknox@optusnet.com.au', 'Testing contact form on CSSSA site (5)', '0', 'fb185810cf911d92a2f228f591938b962aa8fae2', '2020-10-08 16:01:01');
                        )

                )

        )

    [7] => Array
        (
            [Email] => Array
                (
                    [0] => An email with the details below was sent successfully:
                    [1] => To:burney.c@gmail.com,  supportservicesa@outlook.com.au
                    [2] => Subject:Contact message from CSSSA website
                    [3] => From name:Christadelphian Support Service SA
                    [4] => From email:contact@supportnetwork.org.au
                    [5] => CC:
                    [6] => BCC:
                    [7] => Reply name:
                    [8] => Reply email:
                    [9] => Attachments:
                    [10] => Array
                        (
                        )

                    [11] => Body:
<table>
<tbody>
<tr>
<td>Name:</td>
<td>Margaret Knox</td>
</tr>
<tr>
<td>Email:</td>
<td>margknox@optusnet.com.au</td>
</tr>
<tr>
<td>Message:</td>
<td>Testing contact form on CSSSA site (5)</td>
</tr>
</tbody>
</table><br /><br />IP: 49.184.169.137
                )

        )

)

Has no one any ideas?
​
Having this "try again" messageon the Thanks page is confusing for visitors, and I'd like to be able to remove it asap🙂