Sorry, friends....
It seems that the software that I've used for downloading data and applying EOD data has been skipping scrips in futures segment.
There are no data gaps in NSE Cash segment, but lots of days in April and May are missing for LUPIN1. So I will have to get all missing data manually from the NSE site
and apply it again. Pls ignore that chart. There are No data gaps in Reliance chart
Thanks to Smart Trade, I actually enumerated dates for both and discovered this problem