Airbnb start to giving refund with no evidence

[K206]

for me as a host , been with airbnb for years. 

recently airbnb have been favourable to guest. 

i have a guest that checked out after 5 days then made a complain to airbnb . saying it wasnt clean and she got 30% of the refund of the nights , she said there is cockroaches there. so i ask for picture , no picture can be provide 

then she complain about the stove doesn't work. it have a E2 code. mean she didnt put the pan properly . we even buy her a new stove. 

no complain after that. thought is all done. 

then after she check out after 5 days airbnb refund 30% of the whole stay. 

this is crazy . as a host trying to help guest much as we can . and airbnb just do their own thing , more and more is not point even have a policy in airbnb