Repeated statements in ttl file cause unexpected reasoning result

[MichelSc]

I use eye version

EYE v10.22.5 (2024-09-11)
SWI-Prolog version 8.4.2

I have a ttl file with my data and model (2 instances, 2 classes)

:d rdf:type :D.
:d rdf:type :D.
:e rdf:type :E.

Note the repetition of statement :d rdf:type :D

I associate a number to instances according to their type:

{
    ?d :op 1.
} <= {
    ?d rdf:type :D.
}.
{
    ?e :op 2.
} <= {
    ?e rdf:type :E.
}.

I want to map a list of instances to their associated number:

:let :myl (:d :e).
{
    :let :myl ?l.
    ( ?v { ?l list:member ?e. ?e :op ?v} ?vs ) log:collectAllIn _:x.
} => {
    :result :is ?vs.
}.

I get the result

ns1:result ns1:is (1 1 2).

Note the repetition of 1: NOK. I expect to receive (1 2).

If I remove the repetition of statement :d rdf:type :D, I get the expected result.

If I put my data and model in the n3 file, I get the expected result.