Primavera P6 - Physical completion % question - I am a beginner

  This is a simple schedule that I have made and I am required to update this schedule every month which is 22 Jan 19.

Please refer to my figure 1 for a simple of this schedule

Now i press the F9 function - scheduling after I have enter physical completion 80% for the buying of materials (A1020). Please refer to the picture below (figure 2).

Somehow this look strange on the gantt chart. Any advise for this?