When I pick 13 Jan 2021 it shows as 13 April 2021 on my list. Also, the ! function doesn’t seem to work on IPad Pro
! doesn’t work on ipad or mobile, you have to press the button on the bottom toolbar instead. It’s silly and should be reported as a bug.
I have no idea about your other issue. It says January and you click 13 and !(2021-04-13) shows up?
Post to the “help” subforum for quickest answers