Submit gets stacked on 'sending' on iOS Safari due to an ad blocker

[botanicus]

As per the title. It works on desktop and mobile Chrome, but on iOS Safari it gets stucked on 'sending'. It works when I tap the refresh button long and select reload this page without content blockers.

Similar to https://github.com/revolunet/react-mailchimp-subscribe/issues/6

Here's my code:

const fields = [
  {
    name: 'EMAIL',
    placeholder: 'Email',
    type: 'email',
    required: true
  }
]

export default () => (
  <Mailchimp action={mailchimpURL} fields={fields} />
)

The live version is at botanicus.me/subscribe.