When i import video to Premiere Pro, it is shorter than it really is

hello, the initial mp4 file is ok, but after importing it, i notice that it stops suddenly and its duration is smaller than it really is. it plays perfect in vlc media player. this is before any transformations made in premiere. how can i fix this? is there a setting in premiere that controls the maximum length of a clip?

thank you very much, i really need to solve this.