DPF soot level changing while car is not moving

Hello!

Can you help me please I have a 2015 1.6 cr 5e5 Octavia around 233.000km in it, lately driving and the car wants to regenerate quicker than usually.. this sunday I had to drive and checked with OBD2 and vag dpf the soot lvl was around 12g (do not know the exact one, but around). Today I started the car and the soot lvl went up to 21g and car started to regenerating, the ash mass is around 58.5g, fuel consumption normal my avg is 4.5l/100km used mostly to work 15km-15km at 90km/h fuel consumption is around 3.6l/100km, any idea why the soot mass changing without any reason while car is just sitting in the garage, maybe the sensors?

Thank you, Luigi