HDD partition table corrupt after power outage

I run a OMV server for more than 6 months without issues until i accidentally turned off my UPS. After turning the OMV box on I've noticed connection to the server has been severed. After connecting a keyboard and monitor and booting knoppix I noticed the one of the data drives is inaccessible. Gparted reports the following errors Invalid argument during seek for read on /dev/sda and The backup GPT table is corrupt, but the primary OK, so that will be used The gdisk output in the imagehttps://ibb.co/Lt74p0p mentions something about the partition being larger than the drive, not sure if the info is useful but the 4Tb drive in question had been cloned from a 2Tb one with partitions grown to new size. Is there a way to fix this issue without reformating?