A Certain Question

Has anyone experienced getting kicked off the online play in custom track multicup while selecting specific track as of recently, cause this has been happening to me yesterday, and possibly it may or may not have happened that to me just recently.
other description, when i choose specific custom track, it says "not chosen", This is not the case when i choose random.

For me it is honestly Both Weird and Frustrating to be experiencing that...

Hope you understand.