Just to give some more info, I have tried sizes:

Height: 57px

Width : 99px



And that works , if i try :



Height: 30px

Width : 65px



It remains at the first size  of :

Height: 57px

Width : 99px



I have 12 calendars and the behavior is the same on all 12.



The purpose of making them small is to fit a full year view on to one A4
printable page.