New Calendar won't create Calendar Items-Type Folder

[SandroRiz]

I want to create more calendars (eg. Folder of type Calendar-items under my root Calendar)

As you see from picture below, very frequently the folder is created with a wrong type (I guess Mail see from icon) and it is obviously not displayed among other calendars. I try to change the dropdown to another type and then return to calendar items but only 2 times has worked.

1) Any suggestion why it happens and how to resolve ?

2) How can I delete the wrong folders ? tool that manage PST  (dangerous?)

Outlook 365 for Win 10 (2004)

Thanks

[#2]

Which version/build of Outlook is that in particular, as I cannot seem to be able to reproduce it on mine (2008 13127.20638). In any case, if you can reliably reproduce this, open a support case.

[#3]

@Vasil Michev 

Version 2009 Build 13231.20418 Click to Run

I can reproduce as you see how many wrong folder I have created; until I have a method how to delete, I don't want to create more...