They received my sister's RFE response on Jan. 29 and none of the bubbles are filled in either. I guess that's because technically the case isn't in Initial Review anymore, nor is it on Decision, they just need to review the RFE response.
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Self filed AOS │Apps Received By USCIS - 3/18/19
│Biometrics Done - 4/11/19
Interview Scheduled - 4/24/19│Interview Date - 5/31/19│AOS Approval - 5/31/19
Permanent Resident Card Received - 6/8/19