Kevin_A I repeatedly set it for 5s or 10s and it always goes back to showing 2s and 5s highlighted or 2s and 10s highlighted.
For what its worth, that bug (with two buttons highlighted simultaneously) is not present on a 12.9" iPad pro or a 9.7" iPad pro running ASIAIR app version 1.8.2 (Beta build 8). It is probably associated with the particular tablet and configuration of the tablet that you are using.
It would probably be helpful to ZWO if you were to tell them the model and year of the tablet, the OS it is using, and how much memory it has. If you encounter this while the app is still running, just submit a log using Feedback in the ASIAIR app's About window, preferably together with a screen shot of what you saw. All the pertinent data will be sent with the feedback submission (although you may want to avoid doing it since it also carries location and networking information and the feedback goes to a foreign server).
Even better, if you have a different tablet or smart phone (I only have tablets, I still use a flip phone), try it there to see if the behavior is different.
Chen