> The pinout of the 7805 is IN-GND-OUT, when looking from its
> front, isn't it ? (at least that's what I've found on the datasheets

Correct. Maybe you've a bad 7805 (possible) or capacitor (unlikely).
Do you have spares to substitute to find out ?

You haven't mistakenly used a 7905 have you ? (just a long shot)

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