Why Have Puzzles Became Easier

Myself and all my students even say in the last three (3) months puzzles have became easier. Why is this or why did Chess.Com change the levels? 

Thank you 

Still hard enough for me

@YoupIIII That's cause your a little bug (your a little bug student of mine however! ~ thus I can say such to ya remember all bugs sooner or later get squished so keep up the great work and turn into a monster

@YoupIIII Whoa ... forgot to put a great respectable as you all are we have great times student of mine! and your puzzle rating is pretty serious great job! You are holding 3rd place on our leader board at 2538! Lego Student almost climb above you today ... look out for him ... he is climbing to push you out of 3rd

Great students to which I have no words but onward in life and chess ~