[Resuelto] trying to find a specific string on my website

Background of the issue:
I am trying to resolve an issue with a contact form on my website enlace oculto. I have specified the email message format using class ID - %%contact_number%%, which allows customers to input their phone number. However, one version of this form had a space after the %% so it wouldn't work, appearing as %% contact_number%%. This incorrect version appears multiple times throughout the site according to string translations.

Symptoms:
I am receiving customer emails from the contact form where the message shows %%contact_number%% instead of the phone number.

Questions:
Where is this string happening on the site?
How can I find and change the English version of the string?