LR 7.3 continues to be wonky

Using LR version 7.3.  Working on assigning star ratings and all is working fine then out of nowhere, I press "3" to give a 3 star rating as I had just been doing successfully for about 45 minutes and no star rating shows up.  I get confirmation that 3 was assigned via pop up note and I I go to menu>photo>set rating it also shows the image as having a 3.  Why no "3" with the thumbnail????????????