bad WKT features positioning

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What steps will reproduce the problem?

1. Postion any point on a map passing WKT parameter:

http://wms.latlon.org/?format=image/png&layers=osm&width=800&height=600&bbox=-83
,-41.8,67,68.8&wkt=POINT(-8.55%2042.85)

The above point is positioned in Ireland (as a green mark). 
But in fact, the point coordinates are from Spain (-8.55 W, 42.85 N). 

2. Change any of the latitude limits of the bounding box (2nd & 4th values of 
bbox), but don't change the POINT coordinates:

http://wms.latlon.org/?format=image/png&layers=osm&width=800&height=600&bbox=-83
,11.8,67,68.8&wkt=POINT(-8.55%2042.85)

Now the point is drawn at the sea, outside of Ireland

3. So, the bounding box is affecting wkt positioning, I guess.
Changing bbox should only have affected map boundaries and stretching (for a 
given width/height), but not the point position relative to background map.

What is the expected output? 
A well positioned point over a background map (based on its WSG84 geographical 
coordinates)

What do you see instead?
A bad positioned point

What version of the product are you using?  
tWMS project demo server at http://wms.latlon.org

On what operating system?  http://wms.latlon.org operating system (not mine)

Please provide any additional information below.

My own installation (twms source 0.01q on Ubuntu 10.04, web.py standalone 
installation) behaves in the same wrong way

Original issue reported on code.google.com by [email protected] on 15 Jul 2010 at 4:54