That wood wall transition you used to finish off your tile edge really was a poor choice.
The "u-channel" that sits on top of your pan isn't really meant to be secured by just a couple of tiny screws. You need a heavy layer of silicone to adhere the hardware to the pan, as well as make it watertight. I sure hope you added extra framing studs and braces since you are using such a heavy glass enclosure.
Btw, nice job on the bathroom so far.