This result could change physics forever

Why are we saying it doesn't  "fit" the standard model....   Doesn't this discovery just mean that we have a puzzle that we are  still constructing that we don't know the number of pieces to we , and we have "looked" (by theorizing, and testing)  at that incomplete picture on the  box that contained the puzzle pieces that we started putting  together  and we found out that the picture  on the box just extends more beyond the borders of the puzzle box than we thought.   Forgive my ignorance, but does the term "Standard Model" basically mean Scientists take a stance that the current known state of physics  in all its known or full fleshed out theories are taken as the  "truth" until otherwise discovered otherwise such as in this very instance you are talking about right now.  So this discovery is OUTSIDE the known current "truths"  and it may more importantly  change previous thought of "truths"  or fill in holes in some theories that could not yet be verified?