Testing and Issues
You can test this app and submit issues during the testing period of the iOS Chart contest.
Entries with serious issues will not be able to win the contest, but even minor issues might be important for overall results.
— Incorrect behaviour during when filtering the first and second graphs (the attached video #2).
— Borders are unstable when scrolling or scaling (the attached video #3).
— iOS 12+ only.
Im not just picking on you, it really is a usability issue.