You could provide some screenshots, if you can. :3
Anyways, try maybe checking the practicle forder and see if you see anything like this?
Example~
_0, _1, _2 and so on.
Or... like something~
aura_0, aura_1, aura_2 and so on.
Then delete them and try again with you're map! ^.^
Or, try this Hugrf, helpful tutorial on everything you need to know about map making.
I saw there ground Texture tutorial also. Maybe It'll help! ^.^
Good luck, my friend! ^.^
http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=34893.0 (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=34893.0)
Maybe this will help: http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=13363.0 (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=13363.0)
Hopefully that works. ;) Also, maybe try not to blend the colors in Gimp or whatever program you use.