Because most of the people that post here have bothered to put in the legwork to educate themselves instead of having everything spoonfed to them. We try not to let people dumb down the board too much, but sometimes it happens.
Did you really post your OP then bump it 20 minutes later because you hadn't gotten any responses? For fucks sake.
To answer your question simply: The huge jumps were a result of lab timing. If you put something into your body, then test its concentration 2 weeks later, how much do you think is going to be left? It doesn't just stay there indeterminately.
When you switched to once a week, you probably got them tested at the proper time. Which indicated your value.
Basically, the values are useless without putting them into perspective from when you last administered your dose.
Either that or you fucked up giving yourself the shot. Could be a possibility.