Integrating code from BeePro to Marketo... why is the code cutting off in the Marketo email code editor?

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Integrating code from BeePro to Marketo... why is the code cutting off in the Marketo email code editor?

I've never had an issue copying code over from BeePro into Marketo, but today it's acting all weird. The second half of my email doesn't get copied over. Any idea why this is happening and how to fix it?