Stockfish 5 played these moves. Is this a bug or a genuine blunder?

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Were move 13 and 14 genuine blunders by Stockfish Level 5 or was this a bug in the system? Dosen't seem like something Stockfish 5 would play in any move with a non-losing position. Pls don't judge me on my queenside pawn advances I was just having fun. Pls reply with your opinion.

This was FROM POSITION, a French Defense

I was white

Yes, SF5 might also do a nonsensical piece drop

that's why human opps are better

Isn't that a technical bug?

No, it's not a bug. It's level 5 out of 8, it's supposed to make mistakes sometimes. Try higher level to make things more interesting!