If I understand correctly you currently redefine $fundCount
every time as 0 when you go through the pages.
Maybe try something like that:
{{ $fundCount := 0 }}
{{ range (where .Data.Pages "Type" "project") }}
{{ $fund := .Params.raised_fund }}
{{ $fundCount = add $fundCount $fund }}
{{ end }}
<span>Total Fund:</span> {{ $fundCount }}
And please explicitly check that you are using 0.48
by typing hugo version
, since some packages are not yet updated.