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I cloned your form and I was able to replicate the issue regarding the "remove" button.
We can decrease the width of the "remove" button so that it will fit in the container. Please try inserting this CSS code inside the widget.
padding: 2px 7px;
Just click the widget field and then click the "Widget Settings" button. Go to the "Custom CSS" tab and paste the code. Click the "Update Widget" button when you're done.
Here's the result:
Hope that helps. Thank you.