tickLower tickUpper do not exist in underlying pool

[ticruz38]

I want to know which range my position apply in an underlying pool, I get the tickLower and tickUpper returned by my position and try to look after them in the underlying pool, but they seems to be out of range.

Here is my query

positions(where: $where) {
    id
    owner
    tickLower
    tickUpper
    pool {
      ticks(orderBy: tickIdx) {
        tickIdx
      }
    }

Here tickLower Idx do not exist in the list of ticks for the underlying pool, in my case the idX is too high... Is it an expected behaviour, how could that happen?