mongo db multi record not working

3 records need to be updated when I use multi:true only one got it update
which is similar to NOT using multi:true. Is something wrong with the
update statement ? thanks for response.

test@-Mongo-> db.transactions.find();
{ "_id" : ObjectId("536629e371ac8ef534bb2500"), "source" : "A",
"destination" : "B", "value" : 100, "state" : "initial" }
{ "_id" : ObjectId("53662a6e71ac8ef534bb2501"), "source" : "A",
"destination" : "B", "value" : 100, "state" : "initial" }
{ "_id" : ObjectId("53664fb471ac8ef534bb2502"), "source" : "A",
"destination" : "B", "value" : 100, "state" : "initial" }

test@-Mongo-> db.transactions.update({_id: t._id}, {$set: {state: "pending
"}},{upsert:false,multi:true});

WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
test@-Mongo-> db.transactions.find();
{ "_id" : ObjectId("536629e371ac8ef534bb2500"), "source" : "A",
"destination" : "B", "value" : 100, "state" : "pending " }
{ "_id" : ObjectId("53662a6e71ac8ef534bb2501"), "source" : "A",
"destination" : "B", "value" : 100, "state" : "initial" }
{ "_id" : ObjectId("53664fb471ac8ef534bb2502"), "source" : "A",
"destination" : "B", "value" : 100, "state" : "initial" }

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