Your midterm grades are now available on D2L.  The grade will be shown in the form of a fraction – something like

74.00 / 88.75 B

… which means that this student’s current average is 74.00/88.75 = 83.  D2L’s doing this because some parts of your grade (like the laboratory exam, notebook, and cleanliness/safety grades) haven’t had anything assigned to them yet.  At the end of the term, your final numerical grade will be shown the normal way, since all the components of your grade will have been entered.

No grades have been dropped or replaced yet.  That will happen at the end of the term.

The letter grade on D2L is correct as shown – you don’t need to divide the numbers out to know your letter grade.