Multiday events shuffle when overlap

i have series of long events in the same month. first event kicks in and runs on the MEC, no problem. When second event starts, it will shuffle existing down and continue in the same line, Third event will start and shuffle both existing events again…. this becomes ugly. why event cannot hold the same position through it’s duration? I used many calendars and nothing like this ever happened, i must’ve doing something wrong.

there are 4 events here with the different color originally, but it looks like 6. how to fix it?

https://paste.pics/c677b1f4590b276be58abd533fa203f7