Reports

I ended up fixing it by changing the grid structure.

If before was:

<Grid>
   <Row>
   <Row *>
   <Column *>
   <Column *>
   <Column *>
   <Column>

   <Content>

   <TreeItems Row:1 Colum:0-3>
</Grid>

<TreeItems>
   <Grid>
      <Column *>
      <Column *>
      <Column *>
   
      <Content>

   </Grid>
</TreeItems>

By separating the main grid into two:

<Grid>
   <Row>
   <Row *>

   <Grid Row:0> <!--The header now has its own grid -->
      <Column *>
      <Column *>
      <Column *>
      <Column>

      <HeaderContent>
   </Grid>

   <Content>

   <TreeItems Row:1> <!-- Note that now there is only one column so I don't need to declare it -->
</Grid>

<TreeItems>
   <Grid>
      <Column *>
      <Column *>
      <Column *>
   
      <Content>

   </Grid>
</TreeItems>

I still don't understand whats happening on the first option and my main take away is try not to declare a grid with columns and rows at the same time.

79634996