Assuming all the numbers are meaningful and correct (which they aren’t, but let’s just pretend)
You need 2920 calories to maintain your weight, assuming no exercise.
You exercised. In your exercise, you burned 1001 calories.
You NOW need 3921 calories to maintain your weight.
You only ate 3,291 calories (you counted to the single calorie…)
You did not eat enough calories to maintain your weight. You cannot GAIN weight by not eating enough calories: all you can do is lose it.