I noticed when I woke up too that I had extra events about my main shop buff expiring instead of just a single event. I don't remember how many because I just deleted them all. I got the buff again today (just one event) but when it expired, I got 5 separate events for it. I didn't notice this with the morty buff, just the main shop buff so far.
I had the same for the extra wizard quest buff expiring
I just got 4 events for main shop discount expiring
I got 5 events for my Wizard bonus quest buff expiring:

Not an annoyance or inconvenience in any way (because it's easy enough to delete them), but definitely curious as to why it happens ><
Your main shop discount buff has worn out!
x3
Activated this morning and was expired when I came back now.
edit Feb. 1st:
I had thought, this was fixed, this morning only one event for shop dicount buff. Right now the new expired - with a double notice.