A relative had this or a similar test come back positive. This sounds like a helpful signal on paper, but in reality it's not always actionable.
They assumed their previous cancer had survived and metastasized. Doctors couldn't find the source. It turned into a waiting game, where they lived with a sword of Damocles over their head. They were retested every few months and monitored. Then after a year the tests the levels dropped off. And the end result was nothing came of it so far.
It's normal to have some amount of pre-cancerous cells get naturally removed by your immune system. And this catches those too.