Monitors are not counted as a 'licensed asset', but all the rest does.
This report shows you which asset types are eating your license:
Select Top 1000000 tsysAssetTypes.AssetTypename,
Count(tblAssets.AssetID) As Total,
tblState.Statename
From tblAssets
Inner Join tblAssetCustom On tblAssets.AssetID = tblAssetCustom.AssetID
Inner Join tsysAssetTypes On tblAssets.Assettype = tsysAssetTypes.AssetType
Inner Join tblState On tblState.State = tblAssetCustom.State
Where tsysAssetTypes.AssetTypename Not Like 'Monitor'
Group By tsysAssetTypes.AssetTypename,
tblState.Statename
Order By tsysAssetTypes.AssetTypename,
tblState.Statename,
Total Desc