Macro vs MFP calorie inaccuracy

Hi! So I came across a new issue.... In addition to MFP, I’ve been using a separate excel sheet to average my macros and calories throughout the week to get a better idea of how the week went. It’s been helpful because I’ve started increasing my calories to reverse diet. The problem is that my calories in my excel sheet DO NOT match my MFP calories for the day. I knew that there would be some descrepencies just from food labels since they are allowed to round. However, on one particular day, there was about a 1000 calorie difference! At the end of the day when I typed in all my macros into my excel sheet, which calculates protein x4, carbs x4, and fat x9, my calorie count came out to be 2397, even though on MFP it told me my daily calories were 1289. Just for clarification, my protein for the day was 129.8g, carbs were 371g, and fat was 43.9g. Which calorie count is accurate? I had some coffee with milk, a protein shake, and homemade bagel sandwich with egg whites, an enlightened ice cream bar, and for dinner a pasta and ground beef based meal. How could the calories be so different? Which did I eat closer to? Everything was weighed and calculated accurately. Just wondering how many calories I actually ate!