The funnel/tower icon on that IPS Protections screen only hides the Filters sidebar, it does not disable all filtering like it does on some other screens.
You still have some kind of filter applied to your IPS Signatures on the Filters sidebar. Unfortunately there is no way to clear all IPS Protections filters with a single click, and it can sometimes be difficult to figure out where they are set. The quickest way to clear all filters is to click the X to the right of each of the filtering categories (Activations, Type, Vendor, Product, etc.) in the Filter side bar. You need to hover your mouse just to the right of each Category title for the X to appear. Once they are all gone you should see all 9k+ IPS Protections. To add back the filtering categories you want click the "+" icon directly under Filters.
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