Looks like you might have some short cycling going on here, with 4 cycles occurring in the last half-hour. Are you sure there are no valves closed during this time?
It’s odd that the first 3 cycles are super short, yet the 4th runs for a more reasonable 25 minutes, which suggests to me that there is capacity in the emitters to absorb that energy.
This could be the classic Ecodan problem, where it races to get up to temperature as fast as possible, overshooting and turning off. Fiddling with the flow temps / weather comp might help here. Alternatively, there’s something to be said to just turning off the heatpump when the house is warm enough.
For more about cycling, @johncantor has just done a video about it:
