I have an issue when applying filters in a Data Extension for a few days ago. Basically it doesn't work.
For example, if I did a filter from a Data Extension adding the criteria 'Email is not null' it works but, if I add another filter like 'language equals to EN' it stops working properly, showing results that make no sense with the filters (empty email fields or the same count than the previous filter with just one criteria).
Have you ever experienced this kind of bug? I already opened a ticket to support but they are escalating it without any result.