I was able to figure out that it's a software bug. If I completely deleted the form, I could fill it out and press save and it would keep the information that I had added. The problem was that when I filled out the form, it only allowed me to make one single entry for RSUs. If I tried to go back and add more entries (which I could do once I saved it the first time), it wouldn't save the information after I entered it and pressed save again. If I deleted the form and tried to re-enter it, I would once again only be able to fill out one page.
TL;DR, if you delete the form, you can fill it out again from scratch and it WILL remember the information you enter, but you can only enter one page worth of info. Any attempts to enter more info after saving the first page will be lost.
