ᐅ Uneven parquet pattern – defect or not?

Hello everyone,
new oak parquet flooring with a white lacquer finish was recently installed in my apartment. See the pictures.

Unfortunately, in my view, the parquet looks uneven, and I am concerned that low-quality material might have been used.

Question: Are the white edges, which appear on only a few of the floorboards, common?

These were not present in the samples from several flooring showrooms or in the manufacturer’s online images...

Thanks in advance for any experiences you can share!