android - JSoup Elements removes duplicates automatically -

this weird problem don't understand why occur. but, doing following:

elements fullcoursespaces = fullcourses.select("span[class=note-red]"); //get course times 

removes duplicates. returns 2 unique elements, since rest of elements duplicates of these unique elements, removed. when instead, should fill elements list duplicates regardless. there reason why happening?

edit: side note, doing document.queryselectorall("span[class=note-red]"); on webpage gives me elements regardless if duplicates or not.