When eating 6 small meals to lose weight I actually gain it what am I doing wrong?

You lose weight when you consume fewer calories than you burn, you gain weight when you eat more calories than you burn. Eating a number of small meals throughout the day is a good behavioral method to ensure you don't overeat, but in your case it seems that you're still consuming more calories per day than before. You should probably eat less per meal, or chose to eat slightly fewer (4 or 5) a day in order to consume fewer calories per day.