Standard QC for reps. Personally, since no one could possibly see it without having it pointed out to them &/or without a loupe, I would not worry (or do anything) about it.
There are 2 possible causes - either the crystal was not seated fully or the crystal was cut slightly uneven.
But if it keeps you up at night, your options are to take it to a local, rep-friendly watchmaker & have him remove/reinstall the crystal. Or replace the rep crystal with a gen or more evenly cut rep. If you are going to spend the time/money/effort to replace the crystal, by all means, go gen (depending on your particular case, the exact gen model may or many not fit, so your watchmaker may need to do some trial-&-error fitting). They do look nicer & sparkle more.