Can you check the HTML source around the broken parts and paste what you find?

from the screenshot, what i think is that it lack of stylesheet since there is no 
bounding box at all. i'm using the same browser and the same version, that is the 
latest, and its fine here.

try refreshing your browser.

Ah, verified, this bug is specific to the beta site. Marking this as a web 
problem.

Thank you for the bug report! :)

When look into the doc.css,
I see some thing like this

.docs .refentry .parameters .title + p.para + dl,
.docs .refsect1.examples .title + p.para + *,
.docs .refsect1.seealso .title + p.para + * {
    margin-top:-1.5em;
    /* there's a p tag that has whitespace (not :empty).
       This simply covers it up */
}

The comment was explaining that this entry is used
to cover up other element. However, there is p.para
element that actually didn't empty. When i disable
this entry, it fix the problem.

I should have already posted that I know why this is an issue. Unfortunately it 
will most likely require a change in the PhD system. Short-term we can remove the 
style which will cause large spacing issues on the majority of pages but will fix 
the formatting for these cases.

I have fixed this using JS and took out the CSS hack that didn't work and caused  
problematic formatting issues for all types of users.

Now users with JS (most of them) will not experience this layout problem. Users 
without JS will see a little extra spacing but if they don't have JS turned 
on then this isn't their worst problem.

Once PHD is fixed to remove this random empty paragraph tag then this JS can be 
removed.

https://github.com/php/web-php/commit/3042ff3b32f71c4b6b76329c128e56c8de22870e

Thanks,
Paul

The PHD changes would be quite substantial and nobody has been up to the task. I'm going to mark this as closed as it is very unlikely to happen.

Re-opening. Just because it's a PhD issue which might take a while for anyone to look at or fix, doesn't mean we should close the ticket.

The problem seems to be that PhD renders <para> as <p>, what is
certainly not quite right.