Contract Tracking Database - Fixes Needed

Hello! I am building a contract tracking database and have been working on it for a couple of days. Every time I get a problem fixed, I'm presented with three more. I'm stuck on what do do now. Basically, I need help figuring out how to make the last entered date (no matter in which column entered) to append all previous dates... and anything else I might be missing.

Please see the attachment, here is a brief description of what is displayed:

Row 2 shows new contract entry, (this is the start date for all of the other formatting), and a reline date (Column C) that is within the date parameters.
Row 3 shows the formatting once any date is entered into Column K, the last step in the process
**Row 4 that even though the most recent date entered (Column E) is not outside the parameters of the process, formatting still appears in Column A. (Need a fix)
**Row 5 shows that when a step in the process is skipped, the formatting still appears in previous cells. (Need a fix)
**Row 6, ditto row 5, just shows two late steps


THANKS!!