It does not. You are just showing you have not properly studied the topic.
Purgatory is seen as 'extra' time for those not completely sold out to wickedness. Extra time to make amends and prove their heart desires Jesus and true repentance. Jesus's sacrifice on the cross takes one from Purgatory to heaven, nothing else.
If you consider a verse like 1 Pet 4:18 ''the righteous are barely saved'', you will see that a place like Purgatory would be sensible. Or if you consider how on earth not all seem to get ''equal and fair'' opportunity to accept or reject Jesus.
2 Maccabees 12:43-46 43 And making a gathering, he sent twelve thousand drachms of silver to Jerusalem for sacrifice to be offered for the sins of the dead, thinking well and religiously concerning the resurrection, 44 (For if he had not hoped that they that were slain should rise again, it would have seemed superfluous and vain to pray for the dead,) 45 And because he considered that they who had fallen asleep with godliness, had great grace laid up for them. 46 It is therefore a holy and wholesome thought to pray for the dead, that they may be loosed from sins.