I was watching one of Larry Potterfields videos the other day and he starts with a 150 grit and moves to a 220 then a 320. You might have not taken enough wood off with the fine paper to completely remove all the old finish that soaked into the pores of the wood. Stain blends very well so you might try sanding the lighter areas a little deeper than see if it restains darker.
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"...never shot at anybody, if I shoot they get shot!... He's still alive, ain't he?" - Orrin Porter Rockwell
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