This is occuring because the commands for the repeating table are bubling up to the section. If you right-click the section, you will find the same commands in the context menu as you get when you right-click the repeating table.

You must have some kind of a section around the repeating table (or repeating section) to prevent the commands from bubbling up even further, causing other things to get the blue background and dashed lines.

Normally, if you have a node structure like:

<Root>
   <Nodes>
       <Node>
       <Node>
       <Node>
   </Node>
</Root>

You would want to have a section bound to Nodes and the repeating table inside that section bound to Node. This will normally prevent the Node commands from bubbling up past Nodes to Root.