Function_Score Filter on _ttl

Hey there!
I have a function_score query and i try to get only documents with a ttl
greater than or equals a specific value.
But it seems that the query doesnt work. I dont get the expected results.

GET index1/_search
{
"query": {
"function_score": {
"filter":{
"bool": {
"must": [
{
"range": {
"_ttl": {
"gte" : 87105050
}
}
}
]
}
}
}
}
}

In my results there are documents which have a ttl lower then 87105050. How
can this happen?

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