Possible substrate staking pallet bug: empty validator info query results

I noticed a 'hole' querying validator info that may indicate a bug in substrate itself or for example [modifications to Joystream/substrate](https://github.com/search?q=repo%3AJoystream%2Fjoystream+ledger+OR+bonded&type=commits).

The first symptom is the missing `own stake` both in [p-js](https://polkadot.js.org/apps/?rpc=wss://rpc.joyutils.org#/staking/targets) and [pioneer](https://pioneerapp.xyz/#/validators).

On further inspection following chain queries return empty information as well:
- `staking.bonded`
- `staking.ledger`

In following screenshot for each query the first entry is for `j4Rc8VUXGYAx7FNbVZBFU72rQw3GaCuG2AkrUQWnWTh5SpemP` the second (correct): `j4ShWRXxTG4K5Q5H7KXmdWN8HnaaLwppqM7GdiSwAy3eTLsJt`. Both `staking.payee` and `staking.validators` return correct output for the first address (24) and are omitted here regarding the second (26) for brevity.


Please confirm that this problem persists and consult upstream if necessary. (cc @rossbulat )

Finally correct account information for 24 from the p-js details pane:

(feel free to change title based on findings)