Symbol issues

So I have an educational version of Vectorworks Design Suite 2026 and recently some of my symbols for lighting instruments are no longer visible when plotted. It'll show that 11 (or whatever number) symbols were inserted but they simply will not show up on the plot. They're all commonly used fixtures in my house and hasn't been a problem until earlier this week. I did update both my Vectorworks version and libraries. Does anyone know why this is happening or what the fix is? Thanks.