Seekbar does not sync with base slide

Help!!!

When I use the seekbar to fast forward on a slide with multiple layers the layers and audio sync perfectly. However when I drag the seekbar back to the base slide the audio and BS are out of sync (BS does not display). In fact the slide (layers) and audio do not sync until the 1st layer displays.

I have tried changing the "When revisting" to Reset to initital state under slide properties but it does not work.

I want learners to have the capability to fast foward as well as rewind while still on the same slide if they missed a part and need to watch it again and not have to wait to press pervious on the next slide to see the aforementioned slide from the beginning.