Command key not working right in several applications

All of a sudden, some functions are not working right, i.e., in PhotoShop when I select the Zoom key I get a minus rather than the usual plus. In Date and Time, I started getting a 24 hour clock. If I go there in System Prefs and change to 24 hour clock, then the readout on my menu bar is for 12 hour clock. Sometimes when I use Command-Q the machine asks me if I want to close all programs rather than just the one I'm attempting to leave. What is wrong?

Hi n,
I have no idea if this might work, but I'd reset the PRAM and SMC.

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