When on a mobile ( device agnostic / browser agnostic ) there is some incorrect spacing of the time since last post. It appears to be missing a space
My build is 3.2.0.beta4-dev (cf8961e1c1)
I cannot reproduce here on meta. So probably this is not a core bug.
I tried safe mode on your site, and when I disable the themes and theme components, it seems to work.
Maybe have a closer look at your theme customization. It may be related to Moving to a Single Category Style Site Setting and the category icons.
Your feedback is appreciated.
I shall investigate!
Update : As pointed out by @Moin it was to do with a component - namely the Category Badge styles.
Here is how I fixed :
