Something isn’t adding up

So I apparently made $400 in tips in 2 weeks, and I only have $415 in cash. I know for a fact I didn’t have $100 in cash because I keep track (I Also have 4 $50 bills), and I know for a fact I havent spent $300 in 2 weeks. I’ve decided to keep track of my finances for the next 2 weeks in a book to get to the bottom of this, because I’m genuinely curious if the company I work for is lying about how much I’m making to take more out of my paycheck. I got a $700 paycheck yesterday because tips get taken out (so $400 got taken out), and I’m serious baffled by the fact I’ve got only $2000 saved up after working at this company for 6 months. I’m a planner, and I plan ahead. Apparently I’ve made over $5000 the last 5 months. Obviously I spend a bit here and there, but not this much. I have a $309 car payment each month, but even that only amounts to $1545 after 5 months.

I may be wrong, I may end up biting myself in the ass here, but I’ve been worried about this for the last 3 months.