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lol Shams! radio silence in eb category!

Very unusual thing happened with me few days back. I am a principal applicant of EB1 LI A with approved I-140 also filed my I-485, 131 and 765 along with my two kids and wife in Oct 2020 and my case file is in Lee Summit MO national benefit service center. We filed all together mine was accepted and they send back my family file stating incomplete application. I got my fingerprint done got my EAD and Travel doc. I resend my family application again in October 2020 last year and it got accepted and they got their fingerprints done in June 2021. On October 15th my dependents two kids and wife got their 485 approved thereafter their green cards was mailed in post and my status is still showing under pending status after finger prints updated. Just wanted to know is it some kind of a system glitch with USCIS service center or it’s a common thing happens where dependents get approved before principal applicant. Though our receipt numbers are not in chronological order need friendly advise