This was also observed in my case.
In addition, I want to note that when I used tables with a large number of rows (200-300), and a small amount of content in them (a couple of words and links - so I tried to organize my bookmarks of different types), some part of the table content was copied 1-2 times, which in total led to 400-550 rows instead of 200-300. I could be wrong, but it was probably happening at the moment the table was loading as it scrolled.
This was a short period of time after Obsidian released an update for tables. After that update, because of all the buggy nature of tables, I avoid them at all costs, trying not to use them at all, or if I do, only for very small tables.
Before the update of tables, they could not be used because the tables in markdown, in terms of convenience of their creation and editing, is just a mockery of the user. And after updating tables, you can’t use them because it just deforms their contents.
Durable and future-proof file format, I’m guessing.
The fact that the other person had already reported that the contents of the tables were being copied, I noticed after writing my reply, unfortunately.