Hello! Information typically comes from Wikipedia or from each country’s AIP, which is a freely available document. In this case, the information is sourced from: https://ops.skeyes.be/html/belgocontrol_static/eaip/eAIP_Main/html/eAIP/EB-AD-2.EBBR-en-GB.html

In most of the other cases, the information was incorrectly entered in the wrong field or with the wrong units. 