This slight temperature increase above the set temperature level is part of the efficiency program that reduces the number of times the boiler has to come on in order to maintain the temperature you have set. This algorithm is designed to maintain the desired temperature for the longest period of time with the lowest amount of energy consumption and switch on/off cycles.
The algorithm is designed to use the heat in the system most efficiently based on the thermal properties of your house, which tado° is still learning during the learning phase.
In this respect there is no need to micro-manage tado°, where possible it is better to let tado° complete the learning phase.
Thanks for bearing with the learning phase, it helps to make tado° a tailor made fit for your home.