On a fresh engine build you will use up oil to fill the passages, fill the lifter valley, some oil in the heads, etc.

Once the motor was warmed up you should have drained the pan to see how much “drainable” oil you had.

If this particular pan calls for 6 quarts you should have drained 6.

Start at ground zero. Drain the pan and add 6 quarts and see if your issue is resolved. Leave the filter in place.

Work from there.