Due to heave traffic its a message "Checksum validation : Failed" at the time of offset the liablities wait for some time and retry retry retry not any problem at your end its a problem of gst portal
an interesting observation, the gst numbers of the address in F/N ward mumbai the problem of checksum is showing, rest the offset is happening and the returns can be filed
I was informed the same by helpdesk. But this is actually due the a problem with your cache. Try clearing cache or use another browser. I was able to solve this problem by using a different browser.