Problem with extension

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Hi everybody, We have a problem with postgres extensions, we have several servers with several instances on each of them (together 42). Each of those instances are same (except table names - aplication partitioning). But when we are preparing to migrate to newer version of Postgres, we discovered this.
On all servers, there are tables with hstore columns, therefore there is hstore extension in use. In order to upgrade from 9.3 to 9.5 we need to run "ALTER EXTENSION hstore UPDATE;" on each database. But on some instances, it says, there is no extension hstore:

XY=# alter extension hstore update;
ERROR:  extension "hstore" does not exist

On "correct" instance \dx shows (after alter):
XY=# \dx
                             List of installed extensions
    Name     | Version |   Schema   |                   Description
-------------+---------+------------+--------------------------------------------------
 adminpack   | 1.0     | pg_catalog | administrative functions for PostgreSQL
 hll         | 1.0     | public     | type for storing hyperloglog data
 hstore      | 1.2     | public     | data type for storing sets of (key, value) pairs
 pgstattuple | 1.0     | public     | show tuple-level statistics
 plpgsql     | 1.0     | pg_catalog | PL/pgSQL procedural language
(5 rows)

On "weird" one \dx shows:
XY=# \dx
                         List of installed extensions
    Name     | Version |   Schema   |               Description
-------------+---------+------------+-----------------------------------------
 adminpack   | 1.0     | pg_catalog | administrative functions for PostgreSQL
 hll         | 1.0     | public     | type for storing hyperloglog data
 pgstattuple | 1.0     | public     | show tuple-level statistics
 plpgsql     | 1.0     | pg_catalog | PL/pgSQL procedural language
(4 rows)


We are running:
Name        : postgresql93-server
Arch        : x86_64
Version     : 9.3.13
Release     : 1PGDG.rhel6

On  CentOS 6 2.6.32-431.20.3.el6.x86_64
Each instance has a replica on different machine (via WAL shipping as well as streaming replication) and problem is on both of them (master and slave)


Weird is, when we try to add extension again (via CREATE EXTENSION), it ends up succesfully, but \dx won't show it

Another thing, when we try to add extesion with insert to pg_extension it gets OID  far greater than any other:
XY=# select *,pg_extension.oid from pg_extension;
   extname   | extowner | extnamespace | extrelocatable | extversion | extconfig | extcondition |    oid
-------------+----------+--------------+----------------+------------+-----------+--------------+-----------
 plpgsql     |       10 |           11 | f              | 1.0        |           |              |     12617
 adminpack   |       10 |           11 | f              | 1.0        |           |              |     16471
 hll         |       10 |         2200 | f              | 1.0        |           |              |     16472
 pgstattuple |       10 |         2200 | t              | 1.0        |           |              |     16473
 hstore      |       10 |         2200 | t              | 1.2        |           |              | 366992783

 Any ideas what to do to fix?

 Thanks
 Tomas

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