Pagination and sorting with _id

i have a quey where we were using pagination with skip and sorting the data with _id, but now when i am adding pagination with _id then the results are not accurate

Posts.find({_id: { "$lt": lastPageLastDocIdOFPrevReq }) .sort({ _id: -1 }).limit(15)
is there any problem with the query, or in case of sorting with _id: -1 we need to use skip overe here, which will be expensive i guess.

@sajan_kumar Please go through this link Mongodb Pagination

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How are they inacurate? What are the issues you faces?