When using an RTL language and viewing in responsive mode, there is a 5px margin between the last visit / current time.

The margin is not there when using an LTR language.

I think the margin is supposed to be there - so the issue is with the responsive stylesheet but due to the points below the fix is tricky.

In the responsive.css stylesheet, the 500px media query is above the 700px media query.

(this is the wrong order and causes issues if both the 500px + 700px query have a rule for the p class)

In the bidi.css stylesheet, the 500px media query is below the 700px media query.

(this is the correct order)

If the 500px media query and its contents in the responsive.css stylesheet are moved below the 700px media query - the problem is solved.

For my base style I moved all the media queries in to the correct order from high to low in the responsive.css stylesheet but that required some testing but it may not be practical for you to spend time implementing this change just to fix a 5px margin if Prosilver is going to be phased out soon.