Quantize snap importing and saving

hi guys. im trying to work out if this is a bug or if there is another reason for this.

I have various quantize grooves that i want to import to cubase 12 to use as my swing grooves.
I drop the midi files in fine, i save the groove fine and the list is there but as soon as i close cubase down and re open it they have not saved… It strangely saved a few but generally its not saving them after re start.

have anyone else experienced this or know why this is happening ?