Feature This Photo: Display bad quality thumb in album

Hello. Steps:
1) navigate to album https://crimson-land.ru/groups/33-horrorgasm/albums/9059-razor-candi-v-obraze-elviry-povelitelnitsy-tmy
2) Feature any Photo.
Result 1: Photo become bigger and it has good quality
3) refrash page
Result 2: album display bigger photo's thumb with bad quality.
Expected result: Featured photo's thumb should be in good quality (like in Result1).

Did I miss some settings?

Thanks.