There’s nothing wrong with the jump pack, you just needed to use the “manual override” setting.
Anytime a battery is below a certain voltage threshold, you need to put the pack into manual override to jump it.
If you don’t know how to do this, consult the manual, or give a quick google.
I have 6 different NOCO jump packs, and two NOCO chargers in my boat. I’ve had a few of them for 5-6 years. I’ve never had a single issue out of any of them, and I’ve used some of the packs HARD. Even for thing like supplying constant 12V (manual override mode) to trailer winches and other “off label” uses.