I logged in TER in the morning and there was no PM in my inbox. I come home work and find two. One  was sent yesterday and another one today. The latter one is fine, but I never saw the one from yesterday in my inbox when I logged in the morning ! I should have.  

Sent myself a PM and got it instantly, before I lifted my finger off the screen.

j/k  I wanted to laugh at the idea of sending yourself a PM.

Might just be a glitch.
I have seen some random delays in the past, where one PM gets delayed for some reason, but sounds like you had several in a row, and in both directions.

I copied myself and received it back instantly.

j/k  Time remains linear, even on TER.

... which is, on at least two occasions, one just now, I click on a post in a discussion forum, and I'm sent not to that post but to a post in a totally different thread.  It happened just now when I clicked on the post re what Commander Spock would say in a thread below.

...one of them fixed one after I PM'd him to let him know about it.

Same for TS and CPA.

Re: Do you respond instantly...or ever for Subject #1 and #2... (E)

No. Never.

Yeah, it's weird, when you click on RR's post about Commander Spock it brings you to another post on another thread completely.  Like the link address was somehow encoded wrong for that post.