When the preceding statement is being to be created, creating the next statement is impaired because the property label of the subsequent to be edited statement is scrolling down.

When the user would like to click into the next property, the property is scrolling downwards.

So the mouse cursor gets positioned above the new to be created statement, and the user needs to have an additional click to choose the property.

This is disturbing the user, and prevents efficient interactive working and typing.

Possible reasons of this bug: potential problem with CSS code? Problem in Javascript code?

Solution: the screen should not scroll while/after a statement has been created.
It should be possible to already start creating the next statement while the previously created statement is still in save ongoing mode.