There seems to be a bug in the display of the nodes. Whenever there is a "<" or "≤" sign in the text of a node, all the text after, including the sign, disappears, unless there is a ">" sign after it (then the text after the ">" sign is displayed correctly). I suppose it is recognized as code but I hope you can fix it somehow. Cheers.
Please report this problem to firstname.lastname@example.org and make sure to use a valid email address so that we can contact you for additional information. Thanks.