In the EasyEDA editor, my PCB looks like this:

When I generate a Gerber for my PCB, the bottom looks the same using a popular online Gerber viewer.
I uploaded the same board to JLCPCB last night, but now it looks like this in the order status:

Did I just waste $50?
Chrome
70.0.3538.102
Windows
7
EasyEDA
5.8.22