Persian font dont support some times with some rss webs. I sent you 2 screen shots
app version: 5.1.0
android version: 7.1.2 (N2G47F)
device: LGE Nexus 5X (bullhead)
sqlite version: 3.9.2
username: khatoonabadi
server: default
memory: normal
speed: 60 feeds in conn:1850 read:8 parse:55 store:67
pending actions: pre:0 post:0
premium: no
prefetch: no
keepread: no
thumbs: yes