Thanks for your quick response.
I don't get your answer though. When I don't select the tags i just see one red line and not the time spend on an each day divided by the tags. When doing an export, it also messes up my hours.
When I work on a task which has 2 or more tags, I expect to see that the amount of time spent on a task is shared over the selected tags. With two tags my work hours are now doubled (or even further multiplied with additional tags) and to me that doesn't make any sense.
Although I found a manual workaround to cut the day in pieces and then add one tag for each part of the day it is and very labor intensive and in some cases not exactly what i hoped to find. Sometimes one task just shares tags in equal amounts.
Maybe we miss each other point, but maybe can show how you would prevent this.