Filtering by competition sometimes not working

For certain leagues (PL is one I’m sure of, not sure if there’s others), when you click on a fixture in that league, and then filter out the cup competitions in order to try and league-only data, it will still include certain cup games in there. For example, on the upcoming United v Palace game, I filter to the 25/26 season, and then I untick all of the other comps apart from PL, but United v Grimsby EFL Cup game still shows up and contributes to the data for each player that played in that game. So in that case it could lead to inflated p90 stats if what someone wants is league-only data.