Hi, you have to transform your dates in proper dates (e.g. via as.Date() or lubridate::ymd()) or into an ordered factor to make them appear in the order you want. Now they are ranked in an ascending order. You could, to make it easier to compare, use facets via facet_wrap() and also try the {gghighlight} package to show all other lines in the background.
Please provide a reproducible exampel next time so we are able to create and modif your code and plot. This helps both sides. For more see here.