Communication and Utilities go to schedule C line 25 even though they are split out separately in the interview steps. I enter $100 under Communications and $200 under Utilities and $300 showed up on Schedule C line 25 Utilities.
Well, it is probably traceable somehow to that, if you were trying to deduct the pro-rata share of your total utilities from the home office. You can override, but it is better to use Forms mode to trace the source of the entry to see if it is correct. You can double-click on entries, or right click and select data source to try to track it down.