Facts endpoint returns multiple identical facts

[skarampatakis]

Tried this URL and it returns multiple identical facts while this is not the case for the dataset in RDF format.

The same query on the triplestore returns less observations

prefix qb: <http://purl.org/linked-data/cube#> 
select (count(?observation) as ?count)  where 
{
?dataset a qb:DataSet .
?observation qb:dataSet ?dataset ;
<http://data.openbudgets.eu/ontology/dsd/greek-municipalities/dimension/budgetPhase> <http://data.openbudgets.eu/resource/codelist/budget-phase/approved> ;
<http://data.openbudgets.eu/ontology/dsd/measure/amount> ?amount .
values ?dataset {<http://data.openbudgets.eu/resource/dataset/budget-athens-expenditure-2010>}
}

try me