Notes from buyer text box has blank spaces and sends html code to Shipstation

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My shipping team started seeing the below html coming in with every order in Shipstation

Screen Shot 2020-08-05 at 10.37.02 AM.png

<br/>created_at: 1596633998<br/>mc_cid: 44244fbd09

It seems the text box on Cart page has blank spaces which you can see when you can select it (cmd+A). 

Screen Shot 2020-08-05 at 10.36.06 AM.png

How do I get rid of this? Is there a script sending me this error? How do I fix this?