First, Welcome!
Orchids do sometimes self pollinate. You can watch the seed capsule develop for the fun of it, and maybe take a look at the seeds (like dust) when it matures, or cut it off if you don't like the look of it. You're not going to have success propagating from seed, but no harm in trying for your own curiosity. (You can look around the Propagation forum for info on growing from seed as an educational exercise, but without laboratory conditions not likely to be successful - and even under perfect lab conditions, to get new plants is a years-long process)
Sometimes a plant will produce mutated flowers.. if there are only a few, I wouldn't worry about it, Various environmental factors can do it. See what it does next year before worrying about whether there's a genetic problem.
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