Here's your problem.
The entire Default UI is based on a screen/window resolution of 1024x768. Window locations are saved relative to this size. Each window location can be saved so that its left edge sits on the left side, the top edge sits at the top, the right edge stays on the right, or the bottom edge stays at the bottom. When you switch to a resolution other than 1024x768 every child window can move or resize automatically so that they stay on the edges of the screen.
The Fetish UI is based on a screen/window resolution of 1280x1024. So, if you put a window from the Default UI into the Fetish UI, if the window's right or bottom edge is stored relative to a 1024x768 screen size it's not going to look right.
To fix this problem copy the file called eq2ui_mainhud_tcg.xml to your custom UI folder and go to line 2. In the Default UI it says:
<Page AbsorbsInput="false" eq2opensound="ui_window_main_open" MinimumSize="900,200" Name="TCG" PackSize="a,a" PackSizeProp="0000/0001,0000/0001" ScrollExtent="
1024,768" Size="
1024,768" Visible="false">
Change that line to:
<Page AbsorbsInput="false" eq2opensound="ui_window_main_open" MinimumSize="900,200" Name="TCG" PackSize="a,a" PackSizeProp="0000/0001,0000/0001" ScrollExtent="
1280,1024" Size="
1280,1024" Visible="false">
That should fix it I think.