Accounting of plots question

I have recently started plotting an farming as an excuse to build a PC. My Farm on the Chia app shows 236, however if I count all of the plots on my HDD it is 309. At one time my inventory of plots on HDD matched my total shown on the Chia app display. Anyone have any ideas why these numbers would not sync?

Restart app will help show all the plot you have
Or you can try connect to pool very efficient