Recently there is a problem when edditing an article, which has a block of refernece list, that the reference list overlaps the block off infobox as displayed at the screenshot. It happens when you open such page to edit:
and accidently drive your cursor passing by the references and than to infobox area. It hightlights reflist and than once you click in reference area to the taxobox to edit it. You are not opening infobox template, but ref list. I think this might be confusing and basicaly blocks should not overlap eachother.