Bug in Listing Presentation Slides

I think there is a bug while viewing presentation. My two newly items are not displaying, but some other persons old items are displaying in first page of power point presentation (like “Buyer Persona” posted on 1st may 2017, Makeup - PowerPoint 19th may,My App Presentation 3rd may and many others old item display on first page). Where is my presentation display.I check first five pages deeply but my items are not displaying, while checking my portfolio , these are present there.
Why this is happening? If any other author found the same thing then reply here.