Cursor moves to the beginning/end of a table when clicking to the left/right of it. It is easy to do accidentally (e.g. when trying to click on the row context to add a row to the table) and very confusing for large tables.
I am trying to add a row to the Queensland table in https://en.wikipedia.org/wiki/Australia%27s_big_things for the newly erected Big Melon of Chinchilla (a true editing story).
So I start up the Visual Editor. As the table is alphabetially ordered by thing (Melon in this case), I scroll down to get to the entry "Big Meat Ant" in the table in the Queensland section. As I need it to give me the popup to enable me to create a new row below it, I double click on the Big Meat Ant cell and the cell is highlighted and the "arrow" appears on the left of the row giving me access to the "add row below" function. If I click that arrow, all is well. But if I just miss the arrow when I click by being a bit to the left, I get taken to start of table. That's both very annoying but reproducible.
Sometimes when I try to click the arrow, I get dropped out of the Visual Editor completely, but at this moment I can't reliably reproduce that behaviour but it happens often enough that I'm not imagining it.