Indoor chime delay

Hello, have had this issue since I installed our doorbell. What happens is that when someone outside presses the button, our indoor chime initializes, the “ding” if you will, then about 2-3 seconds later the “dong” happens, if that makes sense. Instead of a fast “ding-dong” it’s a “ding”…….2 seconds later……..”dong”.Looked on YouTube, with no success on how to fix. Can anyone help, suggest what the issue may be with a fix, or has anyone also experienced this, and if so, how did you fix?Thanks!