Word to Emoji Rules Changing? On phone

Hey, 2 days ago I downloaded to try "Thumb-key" ad I discovered it from here, it looked fun and is fun. Now I just gave a problem which is for me personally pretty annoying. I use Signal and usually when writing to my SO, I write :heart: to get a ❤️ or I write :kiss: to get a 💋 emoji. And for some reasons since I...