I run aCalendar on my phone (Samsung GT-I8262 Duos, Android 4.1.2) and on my tablet (Nexus 7 1st Generation, Android 5.1.1) and something strange/funny happens.
When I update my calendar on my phone and then synchonize it with my tablet, everything I added gets coloured red (on my tablet) although I colored them in different colors (on my phone).
The thing is, this doesn't happen if I update the calendar on my tablet and then synchonize it with my phone. Everything stays as I made it, in the right colors.
Have any of you any ideas?