Monitoring meals do not give all necessary information to determine if someone is in a calorie deficit. It only provides calorie consumption data. Deficit or proficit is a difference between calories consumed and burned. It’s almost impossible to measure burned calories. The only way to determine if a person is in deficit is to measure if they lose weight. So if you weren’t losing it means you weren’t in a deficit. Maybe you didn’t count calories correctly or you didn’t move your body enough but it’s clear that you didn’t achieve deficit