Layer order on revisiting slide

Hi! I am having problems with the layer order when revisiting question slides containing the built-in review layer and another layer (Feedback) over the top of it.

• The slides are quiz slides that are being reviewed. They contain the built in Review layer which has some content on it but it also has a trigger to show the Feedback layer when the timeline starts. 
• Feedback layer contains a button to visit another slide to review the content. They are then returned to the question slide.
• When the user returns to the question slide, the layers are in the wrong order so the review layer appears over the top of the Feedback layer.
• This happens all the time when the slides and layers are set to 'Resume'. Strangely, it also happens when the button to leave the slide closes the layer and then it is re-triggered by the Review layer. This happens the first time but subsequent times it works fine. 
• It doesn't happen on the first visit to the slide when it is showing the review layer.

Things I've tried:

• Adding a trigger to close the Feedback layer before leaving the other slide (and re-triggering it on return to the slide)
• Putting a short delay (0.1s) on re-triggering the Feedback layer (combined with above)
• Resetting the layers on revisit
• Resuming the layers on revisit
• The slide itself must stay on Resume or the learner won't see their answers to the questions (and it doesn't help switching it to 'Reset' anyway).
• I need to be able to show/hide the feedback so the learner can close it and read the questions.

Any ideas? Or does the Review layer just always push its way to the top of everything? Or is this a bug?