Sync problem with PNG sequence.

Hi !

I render a PNG sequence with the same fps from my original footage, 23.97

When I import this PNG sequence into Premiere, even if my sequence settigns are also 23.97fps ... the sequence always plays much faster, like almost 30% more speed

What am I doing wrong? How can I keep the same original speed when importing a PNG sequence to Premiere, so I can sync it with the original audio (it's a musician playing)??

Thanks a lot in advance!