Coming back from vacation

If you turned vacation mode on you shouldn’t have accumulated any reviews. Do those reviews show up on the site? If not, maybe the app will resync after you turn vacation mode off (I don’t use the app, so can’t say for sure).

As far as the forgetting goes, you can either just do reviews and let it work itself out, or you can use something like [Userscript] Self-Study Quiz (which really needs to be used on a computer) to drill some of the material for a few days.