I'm not sure if that is normal for Eloquent Cay maybe someone who grows it can chime in. A few that come to mind as being partially open for a day or two are Planet Claire and Starbase Alpha.
Planet Claire is nocturnal and begins to open the afternoon before
By the next morning it is full size and a gorgeous extra large bloom!
Starbase Alpha is an odd one taking 4 days to completely open. This image shows 3 buds with different days growth.
The fourth day you have a full size bloom.