Response to prints came out grey?

Sounds like a safelight problem. You say the edges are white enough; so if you are using an easel that protects the edges, then I would assume stray light or a bad safelight is getting to the image area during printing. Why the fogging doesn't continue during development suggests not much of this light is getting into the area where the developer tray is. Check the enlarger for leaks, such as light leaking out the top and bouncing off your ceiling. Do this by turning on the enlarger with the lens cap on. Also test the safelight by placing a piece of printing paper on your easel, laying a quarter or a lens cap on it, and letting the safelight shine on it for a couple of minutes. Then develop as usual. It's a good idea to test a new darkroom more extensively, too, but this brief test may show up your particular problem.

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