Field Cards Line Item Restricted

Currently when adding numerous Line Items to a field card you encounter the following "bug"...

Once you reach the bottom of the Designer page due to a number of line items being added you are unable to scroll down to edit each line item in Designer screen.

There doesn't seem to be a maximum number of line items which can be added to a field card however there are only 9 line items which are editable in Designer.

You are unable to scroll further down the page to edit the line items added in excess of 9 line items