Creatures with no rules text display as having the rules text of the first card returned in search if they are not the first card returned in search. For example, search “Konda”. If you sort by name alphabetically ascending, “Isamaru, Hound of Konda” will be first in search results and will correctly show no rules text. If you change the sorting to alphabetical descending, “The Fall of Lord Konda” will be first and Isamaru (now last) will show rules text from The Fall of Lord Konda (see screenshot).

Another example is searching for “memn”. “Memnite” shows the rules text of “Memnarch”