Dear @david.forsyth8QZCL ,
please check in your IsoConfig.xml whether the two areas are identical.
<GroupScheme Name="FlangeGroup" AnnotationStyle="SRectangle" Enabled="true" Tag="XX" Alignment="FlatHorizontal" LeaderStyle="AsNeeded" Components="Flange Bolt Gasket" Field="PartNumber" IncludeMate="true" MateComponent="Flange" MateTag="XX" MateAnnoStyle="Rectangle" MultipleBlocks="false">
<Formats>
<Format Component="Flange" Format="F{0}" />
<Format Component="Bolt" Format="B{0}" />
<Format Component="Gasket" Format="G{0}" />
</Formats>
<GroupFormats>
<GroupFormat Count="1" Format="{0}" />
<GroupFormat Count="2" Format="{0} {1}" />
<GroupFormat Count="3" Format="{0} {1} {2}" />
<GroupFormat Count="4" Format="{0} {1} {2} {3}" />
</GroupFormats>
</GroupScheme>
<GroupScheme Name="FlangeGroupMulti" Enabled="false" Alignment="FlatHorizontal" LeaderStyle="AsNeeded" Components="Flange Bolt Gasket" Field="PartNumber" IncludeMate="true" MateComponent="Flange" MateTag="X00" MateAnnoStyle="OneCircle" MultipleBlocks="true">
<Formats>
<Format Component="Flange" Format="F{0}" />
<Format Component="Bolt" Format="B{0}" />
<Format Component="Gasket" Format="G{0}" />
</Formats>
<GroupFormats>
<GroupFormat Count="1" Format="{0}" AnnotationStyle="OneCircle" Tags="X00" />
<GroupFormat Count="2" Format="{0}" AnnotationStyle="TwoCircle" Tags="X00 X03" />
<GroupFormat Count="3" Format="{0}" AnnotationStyle="ThreeCircle" Tags="X00 X03 X06" />
<GroupFormat Count="4" Format="{0}" AnnotationStyle="FourCircle" Tags="X00 X03 X06 X09" />
</GroupFormats>
</GroupScheme>