Hello Estelle
Thanks for using our plugins and welcome to the forums!
I’m sorry about the issue you are having. Unfortunately I don’t have good news, as at the moment it is not possible to import multiple events which are on the same date at the same time with the same name. Either the names have to be different (e.g. adding a different number at the end) or the start date / time, or the end date / time (although the end date / time I didn’t test).
I hope this clarifies. Let me know if you need more help.
Cheers,
Andras