Hello,
It's a bit hard to diagnose the issue without the full XML because I can't reproduce this error, but here are some possible causes:
- Strange issues like this can happen in you're missing coralui2 and coralui3 libraries. Please make sure that you are consistently using coralui3. You'll know the difference between the two because Coral 2 widgets are at /libs/granite/ui/components/foundation and Coral 3 widgets are at /libs/granite/ui/components/coral/foundation.
- Are your components directly under the <items> node in your XML snippet? Because if so, then Granite is counting each of your components as a column. Instead, you the fixedcolumns node should contain only container nodes (each one being a column) and then those containers should contain the components. Here is some XML as an example:
<?xml version="1.0" encoding="UTF-8"?>
<jcr:root xmlns:sling="http://sling.apache.org/jcr/sling/1.0" xmlns:cq="http://www.day.com/jcr/cq/1.0" xmlns:jcr="http://www.jcp.org/jcr/1.0" xmlns:nt="http://www.jcp.org/jcr/nt/1.0"
jcr:primaryType="nt:unstructured"
jcr:title="Demo"
sling:resourceType="cq/gui/components/authoring/dialog"
extraClientlibs="[cmp.demo.editor]">
<content
jcr:primaryType="nt:unstructured"
sling:resourceType="granite/ui/components/coral/foundation/container">
<items jcr:primaryType="nt:unstructured">
<properties
jcr:primaryType="nt:unstructured"
jcr:title="Properties"
sling:resourceType="granite/ui/components/coral/foundation/container"
margin="{Boolean}true">
<items jcr:primaryType="nt:unstructured">
<columns
jcr:primaryType="nt:unstructured"
sling:resourceType="granite/ui/components/coral/foundation/fixedcolumns"
margin="{Boolean}true">
<items jcr:primaryType="nt:unstructured">
<column
jcr:primaryType="nt:unstructured"
sling:resourceType="granite/ui/components/coral/foundation/container">
<items jcr:primaryType="nt:unstructured">
<text
jcr:primaryType="nt:unstructured"
sling:resourceType="granite/ui/components/coral/foundation/form/textfield"
fieldLabel="Text"
name="./text"/>
</items>
</column>
</items>
</columns>
</items>
</properties>
</items>
</content>
</jcr:root>
This gives the following result:

- You seem to have a LOT of properties in your edit dialog. For UI/UX purposes, I suggest you use tabs to break up all that information a bit for the user. Here is the same XML as above, but now there are two tabs:
<?xml version="1.0" encoding="UTF-8"?>
<jcr:root xmlns:sling="http://sling.apache.org/jcr/sling/1.0" xmlns:cq="http://www.day.com/jcr/cq/1.0" xmlns:jcr="http://www.jcp.org/jcr/1.0" xmlns:nt="http://www.jcp.org/jcr/nt/1.0"
jcr:primaryType="nt:unstructured"
jcr:title="Demo"
sling:resourceType="cq/gui/components/authoring/dialog"
extraClientlibs="[cmp.demo.editor]">
<content
jcr:primaryType="nt:unstructured"
sling:resourceType="granite/ui/components/coral/foundation/container">
<items jcr:primaryType="nt:unstructured">
<tabs
jcr:primaryType="nt:unstructured"
sling:resourceType="granite/ui/components/coral/foundation/tabs"
maximized="{Boolean}true">
<items jcr:primaryType="nt:unstructured">
<properties
jcr:primaryType="nt:unstructured"
jcr:title="Properties"
sling:resourceType="granite/ui/components/coral/foundation/container"
margin="{Boolean}true">
<items jcr:primaryType="nt:unstructured">
<columns
jcr:primaryType="nt:unstructured"
sling:resourceType="granite/ui/components/coral/foundation/fixedcolumns"
margin="{Boolean}true">
<items jcr:primaryType="nt:unstructured">
<column
jcr:primaryType="nt:unstructured"
sling:resourceType="granite/ui/components/coral/foundation/container">
<items jcr:primaryType="nt:unstructured">
<text
jcr:primaryType="nt:unstructured"
sling:resourceType="granite/ui/components/coral/foundation/form/textfield"
fieldLabel="Text"
name="./text"/>
</items>
</column>
</items>
</columns>
</items>
</properties>
<advanced
jcr:primaryType="nt:unstructured"
jcr:title="Advanced"
sling:resourceType="granite/ui/components/coral/foundation/container"
margin="{Boolean}true">
<items jcr:primaryType="nt:unstructured">
<columns
jcr:primaryType="nt:unstructured"
sling:resourceType="granite/ui/components/coral/foundation/fixedcolumns"
margin="{Boolean}true">
<items jcr:primaryType="nt:unstructured">
<column
jcr:primaryType="nt:unstructured"
sling:resourceType="granite/ui/components/coral/foundation/container">
<items jcr:primaryType="nt:unstructured">
<advanced-text
jcr:primaryType="nt:unstructured"
sling:resourceType="granite/ui/components/coral/foundation/form/textfield"
fieldLabel="Advanced Text"
name="./advancedText"/>
</items>
</column>
</items>
</columns>
</items>
</advanced>
</items>
</tabs>
</items>
</content>
</jcr:root>
This gives the following result:
