1,400 calories daily is enough to create a deficit but 1,900 is probably holding you at maintenance. If you're eating at 1,900 more often than 1,400 then that's what's holding you at your current weight. 500 calories will make or break your weight loss. Seems ridiculous but it's true...and annoying.
Also, you're doing very light exercise which is better than nothing but don't count it more than 50-80 calories burned. Not saying this is what you do but a lot of people tend to over estimate. For example if I run 3 miles I burn 250-300 calories at most. I used to think 700 because the machine said so but the folks here at 3FC let me know the harsh reality.