To fix up the issue run Fixup, Compact and Updall utilities as follows:
>>fixup -f (This causes Fixup to check all documents in the database.)
>>compact -i -c -d -K (ignore errors, copy-style, delete view indexes, set large UNK table)
>>updall -R If still the issue persists you may go for third party lotus notes recovery tool that recovers all NSF file components and creates new NSF file with all your contents.
NSF Repair Kit
A must-have Lotus Notes NSF repair utility for home users and professionals dealing with NSF file corruption on a regular basis.