Why did Price Toggling skip some of my products?

Price Toggling only changes products that have a Toggling price filled in on their Add/Edit page. Products without one are skipped, so their price stays as it is.

Add the missing toggling prices, then run Preview again in Plugins → Price Toggling and apply. Also check the Match setting: Exclude applies to every product except the ones you picked. The Activity Log at the bottom shows what each run changed.