Working with a prebuilt 'replay button'

Hi E-Learning Heroes!

I am relatively new to eLearning (12 months, ish) and I am trying to self develop by introducing my own player buttons, play, pause, CC, etc. My question is around the replay button.

As you can see in the picture, I have added a replay button to all my slides in the course. In this example, when I click the replay button, it works perfectly, but then the 'Start' button disappears for some reason. I have added triggers to tell Storyline to restart the timeline at 0s and to stop and play the video (image also attached).

Do I need to add some sort of variable to ensure the start button shows up each time a learner clicks replay?

Thanks in advance!