There are various places in the NodeSet where the Description for a UaDataType is added two times, see example,

<UADataType NodeId='ns=1;i=2618' BrowseName='1:AssetEventDataType'>
<DisplayName>AssetEventDataType</DisplayName>
<Description>
A special \gls{Variable} data type for asset change with a
\mtmodel{AssetType} and \mtmodel{AssetId}.
</Description>
<References>
<!-- HasSubtype - (Reverse) - BaseDataType Structure -->
<Reference ReferenceType='HasSubtype' IsForward='false'>Structure</Reference>
</References>
<Description>
A special \gls{Variable} data type for asset change with a
\mtmodel{AssetType} and \mtmodel{AssetId}.
</Description>

In addition, sometimes an empty description is added at the wrong place in the document, see example:
<UADataType NodeId='ns=1;i=2659' BrowseName='1:MTStatisticType'>
<DisplayName>MTStatisticType</DisplayName>
<References>
<!-- HasSubtype - (Reverse) - Enumeration i=29 -->
<Reference ReferenceType='HasSubtype' IsForward='false'>i=29</Reference>
<!-- HasProperty - - EnumStrings ns=1;i=2861 -->
<Reference ReferenceType='HasProperty'>ns=1;i=2861</Reference>
</References>
<Description></Description>

I guess, you just need to adapt the generator to fix this in all places.