New herringbone parquet beech oiled - what are these dents?

We had our floor (From the early 90s) completely sanded and oiled in November 2017. It looked great at first. In some rooms, we also had parquet (herringbone beech oiled) newly installed (previously there were tiles). Now, the "old" parquet already has various dents. The new parquet also has several dents and holes. Especially in the kitchen area, it looks bad. I can’t remember dropping any cutlery or plates. We have no children, no pets. We do not walk on the floor with shoes. The dents have a recurring pattern. Could it possibly be the vacuum cleaner? See pictures in the attachment.

Hello questioner. An answer to the question about the causes cannot be given without local knowledge. Unusual and speaking against a batch error is the statement that both the old and the new parquet tend to dent. Here the suspicion arises that these dent formations could be related to usage. Speculation, certainly, but nothing else is possible from a distance. Please try the following on two or three dents: Tear off small pieces of a TEMPO tissue, moisten well (should not drip) and place directly on the dent. Cover with a small container, e.g. a cappuccino cup, for about 8 hours. Then the dents treated in this way should have independently reverted back. Regards: KlaRa

If you use the metal tube of the vacuum cleaner from time to time, that is, without the brush attached, the dents could actually come from that. The slight curve of the dents looks like it. Unfortunately, I have managed that too :-( I have been able to "iron out" many dents in our oiled parquet with a bit, really little water, cloth on top, and then lightly ironing again. If the fiber is not torn, it works really well. The dented wood straightens up again. Good luck!

If you use the metal tube of the vacuum cleaner from time to time, that is, without the brush attached, the dents could actually come from that. The slight curvature of the dents looks like that. Unfortunately, I have managed that too :-(
I was able to "iron out" many dents in our oiled parquet with a little, really very little water, cloth on top, and then lightly ironing. If the fiber is not torn, it works really well. The dented wood straightens up again. Good luck!

That sounds very plausible. With the tube directly on the surface, there is also, if you want to circulate carefully, a kind of double contact, meaning you accidentally hit twice with the edge. At least that's how it is for me [emoji6]
And it can also be seen in the photos.

Or one has small children with toys (regardless of whether wood, plastic, or metal) :)

Beech is unfortunately also a rather soft wood. Oak is significantly harder, but you can still get dents in it. You just have to drop a teaspoon and let it land wrong......