Contact form 7 not showing success message

Hello,

We’ve noticed some users were submitting contact forms more than once (in different language locales), which helped us to find that users don’t see CF7 success message.

Content of Form tab

<label> Your Name*
    [text* your-name] </label>

<label> Email*
    [email* your-email] </label>

<label> Phone number
    [tel tel-664] </label>

<label> Add your message*
    [textarea* your-message] </label>

<label> Attach file
    [file file-395 filetypes:doc|docx|rtf|pdf|odt]

[acceptance acceptance-657 default:off] I give my consent to the storage and processing of my personal data
[/acceptance]
[honeypot honeypot-903]

[submit "Send"]
[hidden referer-page default:get]

Plugins installed
Asset CleanUp: Page Speed Booster
Blocksy Companion (Premium)
Contact Form 7
CookieYes | GDPR Cookie Consent
Fast Velocity Minify
Honeypot for Contact Form 7
Invisible reCaptcha
Polylang
Rank Math SEO
Rank Math SEO PRO
ShortPixel Image Optimizer
Stackable - Gutenberg Blocks
W3 Total Cache
WP Mail SMTP

Hope this is something you can help with to fix users' confusion

The page I need help with: [log in to see the link]