weird thing in monthly view

Hi

I have a problem that the monthly view for visitors booking an appointment is glitchy only for January 2020 – available days don’t show up, and it takes a refresh to get them to show. It’s absolutely fine for other months, and it works in weekly view. I’ve got some custom css, but I don’t think that’s the problem:

/*times as one list*/
.time-select-headline + .md-layout.md-align-center {
flex-direction: column;
}

.time-select-headline + .md-layout.md-align-center .md-subheading {
display: none;
}

.time-listing-icon {
display: none;
}

ul.time-listing {
padding-bottom: 0;
}

/*colours for availability*/

.book-day button.md-whiteframe {
color: #21759b;
}

.book-day button.md-whiteframe.disabled {
background: #A2E0FA;
color: #FFFFFF;
}