Youtube indexing

I find google weird....
Yesterday I submitted 10 videoes in the same niche and 6 of them indexed after some hours.

Today I submitted a couple of more vids to this niche too. One vid was indexed instantly but not yet the other one.

Does anyone else find youtube indexing weird?

1 month ago all videoes were indexed in some hours.

google and youtubw get a lot of traffic so their system is all fucked up. thats my guess but thats how its always been with the google company