MIDI notes always sticking on imported track

Hi!
I’ve been trying to import and edit this midi file in Ardour using Zyn-Fusion. However, whenever I play it, the notes always stick after I pause it.

The only way I can stop it is by muting and unmuting it. I’m fairly new to Ardour and have experienced occasional note sticking but none as bad as this. Also, when I make midi tracks inside of Ardour, it seems to work fine. I’m not sure if it matters but on the midi track, it has a weird label which I have’t seen before:
image

I’m using Ardour 6.2-1 and Jack2 1.9.14-1 on Arch with Kernel 5.4.61-1-lts

Any help would be appreciated!