Not quite solved yet. This booking is made for 12 o’clock (site is partly Danish, but I think you can see what the problem is anyway):
https://jl-gruppen.it/bugs/sln-error1.jpg
In monthly calendar, time is shown right on mouseover:
https://jl-gruppen.it/bugs/sln-error2.jpg
In the daily calendar view, it’s shown besides 13 o’clock:
https://jl-gruppen.it/bugs/sln-error3.jpg
WordPress general settings is timezone UTC+1. Could be a spinoff, or similar problem to the problem, that NinaVi described with the Google Calendar time issue
