Hi @DanielaSilveira,
Contacts generated through Google’s lead form extension cannot be automatically synced to HubSpot, probably because the Google feature itself is still in beta. Syncing leads is currently only possible for Facebook Lead Ads and LinkedIn Lead Ads.
If you want to import the contacts from your Google lead forms in HubSpot, you’d have to import them manually.
You can manage Google Ads in HubSpot’s ads tool, more information in the Knowledge Base article here.
Hope this helps!