Probably fair to say these reviews are not uncommon. Had a student who reached out after a 700, for example. He took 6 hours of tutoring and got a 760 in about 10 days (so some people do - "I really wouldn't want to take the exam again is that frequent these days?"). Ultimately, the score went into review and took 15 business days to become Official. Hopefully, nothing to worry about on your end as well.
In case you decide to retake, on the GMAT Knight blog there is an Excel idiom list you may find helpful for Sentence Correction.
All the best.