Wrong index bounds when using "hint"

I have the following two indexes: {Groups: 1, Duplicate: 1, NotFound: 1, DontShow: 1, TSCreated: 1, FacebookShares: -1}, {name: 'DateGroupIndex-FacebookShares'} {Groups: 1, Duplicate: 1, NotFound: 1, DontShow: 1, TSCreated: 1, TwitterShares: -1}, {name: 'DateGroupIndex-TwitterShares'} A) When I run the following query: .find({Groups:1,Duplicate:0,NotFound:0,DontShow:0,TSCreated:{$lt:1405695600,$gt:1405609200}}).hint("DateGroupIndex-FacebookShares").limit(10).sort({FacebookShares: -1}).explain()   "cursor" : "BtreeCursor DateGroupIndex-FacebookShares" ... "indexBounds": { ... "TSCreated" : [ [ -Infinity, 1405695600 ] ], ...} B) And when I run same query without calling "hint", the index bounds for TSCreated is properly computed, although it's not the proper index which is picked up: "cursor" : "BtreeCursor DateBasicIndex-TwitterShares" ... "indexBounds": { ... "TSCreated" : [ [ 1405609200, 1405695600 ] ], ...}