You probably did something wrong with checkin in or out. Check your Travel history. It may be refunded by Customer Service.

Roermond has 2 different masts-for 2 companies-yellow for NS and blue for ARRIVA. You must use (this is a fine dutch way to mislead all travellers without much knowledge-also very often happens to dutch) the masts for checkIN for whcih train you use and also checkOUT first at same company-and in case of a change then for comp. #2. If you do not do that in exact order, a fee of 20€ for missing checkOUT will be charged. Can-sometimes-rectify this via ´uitcheckgemist.nl´

Some other stations, like f.e. Sittard, have gates and these are also separate for the companies.