Lightbulb Network unlock relocks?

I wanted to SIM-unlock my Sony Xperia P as it was locked to one network. I used flashtool to replace the current firmware. After flashing ICS everything was amazing, and it unlocked properly. If anyone is OK with ICS, this is something that can work. But I don't like that software, I would prefer the latest version.
I updated both via PCC and flashtool. After updating to a newer version, it relocked. The phone is working as it should on both firmwares. But I just can't get it unlocked on JB. I've seen a few threads, but none of them seemed so answer this question.

Does JB relocks it to a network? The ICS unlocked everything (see on photo). What is happening, any ideas?

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