I hesitate to call this a bug since I know the mobile app is under development and it could be user error.
I just tried for the first time in a couple of weeks to login using Safari on my iPhone. At first it would show me logged in and synced, but all I could see was the "Add Budget" box, not my budget box. The sync process was also very short. I logged out, cleared my history and data in settings then tried again. This time the sync process was taking a little longer (more like I expected), but then I got a pop up box asking if I wanted to allow Financier to use up to 5MB of storage on my phone. I clicked "increase", it started doing the sync spin again, then I got the pop up increase to 5MB box again. This probably went on for 5 times until I gave up.
At his point I can't login via Safari on my iPhone.