To reproduce this, an add-on from the site needs to be installed to using in IE. Various methods ranging from type into, set text, and send hot key have been used, but still could not solve this.
As mentioned you are not able to type into the second input box, but if you are able to type into first one then include special character tab at the end of the data you want to in first box or use send hot keys activity to move the cursor or pointer to the second input box.