Help! Paint brush size changes automatically!

[Anonymous]

 I'm pretty sure it's a UV problem, but I don't know why? I've just made a single box with an extrude offset on one side and then an extrude minus local translate. Then I've folded it out as in the photo. But when I Send to Mudbox and try to paint the brush changes to a smaller size in the middle of the box, and then changes to the set size when I reach the edges? Can someone help a new one out? PS. I made the model in Maya.

[Its_jay]

try to recreate UV in Mudbox

[Christoph_Schaedl]

could you upload the mesh here.. im not sure whats goin on..

[Anonymous]

Sorry, this is an old post, and have been fixed. I think I solved it by upping the size of the importet mesh, as it was too small, and made Mudbox bug out