So I’m guessing you were over volume resulting in lower OG?
Regardless of what your software may tell you, always a good idea to monitor your volumes as you proceed which will provide you opportunities to make corrective actions if required. I typically don’t really time my boil, but boil to a specific volume while timing my late hop additions to flame out rather than beginning of the boil. I may also vary boil intensity to give me an edge toward hitting accurate volumes. Most important volume is post boil, so all the calculations are for naught if you miss that
Whether the total boil time is 50
Minutes or 70, doesn’t really matter in my observations, more important to hit other parameters.