following is the markdown format I wrote,
Index
----
1.1
----
1.2
---
2
When I press right arrow, page switch from 1.2 to 2,
and I press left arrow to view 1.2, the slide is display as following:

but it should be

Could you give a link or a full example of this issue?
I couldn't reproduce it according to the format you provided.
And what's your browser version? also the OS version?
Thanks.
Hello, This is the Example Link and Slide Mode Link
My borwser version is: Firfox 47.0
OS version is: Windows 10
Thanks !
Seems like Firefox change some rendering path in version 47.
I was in Firefox version 43 but didn't have this issue until upgrade 47.
Try to solve now.
I think here needs some workaround to force it redraw.
Will do it soon,.
I also found out the overview on the Mac glitch even harder.
But I think it's firefox issue, not sure if I can workaround this.

Fix in eab984defff23e2bcf5edfd930714243653eafe2
辛苦了 ~
I made a PR to reveal.js
https://github.com/hakimel/reveal.js/pull/1649