Dear Angelica -
I hope you are taking about incorrect progress displayed by progress lines /
status field.
If I am correct, then check the Status Date in Project, Project Information
dialog box. Status field uses Status Date to calculate the progress. If you
are using Progress lines, then may be have set the progress line to be drawn
w.r.t. to status date.
Info: If Status Date in Proj Information dialog box is NA, the Status Date
is equated to Current Date field.
If my suggestion helps, please consider rating my reply.