WMR status bars and refund amount gone

My return was filed and accepted on 2/12.  On 2/24, I noticed the status bar was there and estimated refund amount was still there.  As of yesterday 2/26, the status bar is gone and the estimated refund amount is gone.  The message now reads, "Your tax return is still being processed.  A refund date will be provided when available." TT 152 provided.    I didn't file any credits (EIC, PTC, and etc), no insurance from the marketplace.  What could this mean?