Shopify has recently added a new layer of reCaptcha protection to the online store contact forms and blog post comments. This change has added a new reCaptcha badge in the lower right corner of all shops:
It's enabled by default, but can easily be disabled in the Shopify Admin.
Step 1: Head into Online Store > Preferences
Step 2: Scroll down to Spam Protection and uncheck the "Enable Google reCaptcha on contact forms" setting: