No midi data recording

Hi i have a Kronos connected in midi with midi links (in/out). When i play with a midi track i have a signal appearing on it. If i use a VST instrument for exit sound i can watch the virtual keyboard operating (notes are being activated normally like my real keyboard). When i try to record the midi track only a single note is recorded all along the track and it doesn’t record my chords. I have no idear about what to do to fix it… everything seems to be right, any idear about this issue? Thks for help