@DanielFernandez
Can you post, if not the actual spreadsheet, a copy of the FILTER function you've written?
Several possibilities occur to me. In general, although we may be tempted to say "Excel is not working", or, as you have here, "the FILTER function is not working," it's far more likely that we, the user, have done (or not done) something that causes the appearance of failure in question. In other words, it's far more likely that the FILTER function is working as it should than that it (after working in thousands, if not millions, of other spreadsheets around the globe) has chosen you and your application to suddenly apply itself to only a subset of the rows.....
Can you describe or discern something distinctive about the rows to which it IS being applied, in contrast with those that it's not? Is it only picking up rows at the top, not the bottom of the full range? Or vice versa?
It's possible, for example, that there is not be a match between how you specified the rows to be filtered and rows of the column(s) to be used as criteria for the filtering
You write that your data are "formatted as a table" and that could mean "I made it look like a table" as opposed to "I set it up as an official Table; it has a name. In the FILTER function I see the table's name and the column's names"
Anyway, those are two things to look at.......
