Hi there, Jeroen! Thanks for getting in touch. π
Short, but great question. The “Event Cost” (or “Evenementkosten”) column is actually tied to the “Event Cost” fields in the single event editing screen (screenshot). The part I bet that’s confusing is that those fields are replaced by the WooCommerce Tickets fields when that plugin is activated and has no relation to the WooCommerce Tickets information. That’s why the column is full of blank values for you, because it is not tied to the price of the tickets.
You can remove the column by expanding the “Filters and & Columns” box at the top of the screen and removing theΒ “Evenementkosten” option from the list of available columns.
Does that help answer your question? Please let me know. π
Cheers!
Geoff