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Two potentials there that I can see:
1) If you have taps with microswitches, one of the switches is misbehaving and/or wiring fault. That would keep the pump powered on.
2) If you have a pressure switch system (no microswitches on the taps, but a permanently pressurised system, tripping the pump on when pressure slightly drops), either the pressure switch itself is not tripping out at correct pressure (most are adjustable), or pressure is leaking out of the system, this can be a conventional leak (usually make themselves fairly obvious with dripping water/puddles where there shouldn't be) OR a non-return valve is leaking and releasing pressure within the system but with no external sign of leakage.
It can be something as simple as a small piece of debris that's lodged on a valve seat that stops it truly sealing off.
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