Events displaying wrong under same timestamp

Hi! It seems that some events display wrong under same column when they are using same time row. Please see the screenshot: https://ibb.co/PTtB0LG

In the second column at 19:00 there are two events: Jooga 60′ and Puntti 60′. However, the schedule shows Puntti 60′ starting in 19:30. In the first column Voima 55′ and Total Body 55′ both start at 18:00 and they both show under 18:00 time row.

What is causing this and how to fix it?

Thanks!