Strange Playback behaviour and out of tune musesounds

Windows 11, 64 bit, 20c CPU 64GB Ram
Created mu first project in MS4

All I did was create a Piccolo and add some 8th notes to first bar. I then made all of the notes staccato.
I then press space bar to play the first bar. The first bar is played and the play cursor moves with the notes. I press space bar again and the play cursor is now scrolling through empty bars but still plays the first bar notes. I then press space bar again and the play cursor is now perhaps on empty bar 8 but still sounding the notes of the first bar.

Also as the Round Robin occurs on the C natural in the piccolo part sometimes it sounds as a C sharp or a very out of tune C

I made a short video but I can't upload that. But it can be found here https://drive.google.com/file/d/1uejt4LpcEfU4ATVGep-U8HX6acF1jJiU/view?…