Anyone that says they don’t balance charge their batteries is either a total moron or is simply trolling you. LiPo batteries cannot “absorb” extra charge like other batteries, they WILL overcharge and the results are disastrous. You need to repair the broken connections inside.
How your charger is even detecting that as a 2S in the first place is also a mystery to me - that must be the lowest quality budget piece of trash charger ever made and you should seriously consider throwing it away.