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Your Pb(NO3)2 probably reacted with the NaOH to get NaNO3 and Pb(OH)2. The SO4 ion might have reacted with the Pb ion, but I doubt it, if this happened you might have seen a slight color change.
In an ionic solution you don't have CuSO4 and Pb(NO3)2 you have Cu2+, SO42-, Pb2+ and NO3- ions floating around freely. If you add a load of OH- ions these will also float around.However hydroxides are generally not as soluble as sulphates so depending on the concentration of OH the lead and copper ions will form a precipitate with the hydroxide ions. Which drops out first and in what proportion will depend on their relative solubilities.