Why are my highlights grey?

I notice that often when I print my negatives (TMAX-400, Plus-X, & Tri-X, developed with TMAX Developer)on Ilford Multigrade RC Paper and Developed with Dektol (2:1, two part water, 1 part dektol stock) for about one to two minutes, some of my highlights are grey rather than white. I've tested my safelight and it is not because of that. Since this doesn't happen to all my negatives now that I think of it, my guess is that my negatives are underdeveloped? Perhaps not enough agitation? Any suggestions? Thanks!

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