telling people i am a "software developer"

telling people i am a "software developer" These days i talk quite well, luckily. However, there are certain words or phrases that still give me trouble. A big one is the "d" sound in "software developer." It only occurs when i tell someone my job title, which is a software developer lol. Using the term "software developer" in casual convo is fine for me. Why is this happening, ya think?