[OpenLayers-Users] Lines disappearing at higer zoom

[Maarten Deen]

I have a map on which I draw longitude and latitude lines. The strange thing is: 
these lines disappear at higer zoom levels.
In Firefox 3, the longitude disappears from zoom 10 and the latitude from zoom 
11, in IE 6, it is zoom 14 and 13 respectively.

The map is at <http://www.maasluip.nl/ebt/ebttest.html>

Regards,
Maarten