Height of month boxes shortens

I have edited the iframe code in Stout Google Calendar, increasing the height of the calendar, so that more events show without that annoying “+2 more”. In SGC, the height is set to 760px, which renders each day’s box to be about 140px tall.

This works fine on the default display of the current month, and even when I click the arrow to advance one month in the future, but when I click that arrow again to show two months in the future, the calendar height shortens, so that the daily boxes are about 115px tall.

Does anyone know why this may be happening? And what I can do to fix it?

https://www.ads-software.com/extend/plugins/stout-google-calendar/