Garbage text added to Shipping Address on "Save Order"

Hello everyone

I am using Woocommerce version 2.4.8.

When ever I go to edit an order, even if I don’t modify the shipping address at all, when I click “Save Order”, the user’s shipping address gets slightly corrupted with a garbage string (or at least that’s what it looks like).

So assume I had an order where the customer’s shipping address is:

1 Main St
New York, NY
10001

As soon as I click “Save Order” the shipping address is now:

1 Main St
field_549c9ad388de8
New York, NY
10001

If I go back to edit the shipping address, the “field_549c9ad388de8” is what the value for “Company” is. I can’t even delete it because I soon as I click “Save Order” it’s reinserted. Also, the value is always “field_549c9ad388de8”, for all users and for all orders.

I am using a custom theme I made, but my theme only modifies the woocommerce template files and if I go to Woocommerce’s system status I see no errors in my template file versions. I’m really confused why this “field_549c9ad388de8” is appearing, and can’t think of what might cause it.

Has anyone seen anything like this before?

https://wordpress.org/plugins/woocommerce/