Page Rules still 502 error

Cant share url on public community as these are for my website administration area
but as I mentioned I have defined url as:

* is available for purchase - *

here is the screenshot of page rules area:

Note: the space before last * sign is not there in rul but had to keep it here to show as the forum was formatting my text if dont give the space.
and settings as described. Sill I am getting 502 timed out error, specially when server it too busy with many request.