Restoring the back wall resolved the issue. Thank you very much for your help!

Thank you very much for the response. While this did revert the style the right and top borders still seem to be missing.
Changing the wall/border settings on the chart doesn't seem to make them appear or change.
What could be the cause of this?

Currently we are having an issue with a Gantt chart in our Xamarin.Android and Xamarin.iOS application. We recently upgraded our TeeChart dlls from version 4.15.07.01 to 4.2018.10.3 to fix a crash occurring on newer Android and iOS versions. This is a 3 year version leap, so with it came the expecte...