There are some CSS oddities on the live Wikipedias with GuidedTour and RTL languages. It is evident in production mode, not debug.
This is separate from bug 44804. For example, it is evident even when the guider is in the center (which requires no flipping)
It is not present on test machines, so it might be related to something in e.g. Common.css
are transparent, and the okay button is wrong.
It is not present when there is no flipping, e.g.:
so there might be some connection to CSSJanus.
T40294: jquery.articleFeedbackv5.special styles loaded incorrectly in RTL languages
T37059: Dialog has no style applied and therefore is transparent (jQuery.UI) for RTL languages and monobook