SanDisk 64gb USB only showing 34gb, how do i fix this

So i've tried searching around for an answer and i cant find anything related to it. I used the usb to recover a friends windows laptop and at that time it had also said it had 64gb on the drive. But after it was used it only allowed a maximum of 34gb on the drive. While i was looking through disk utility I clicked show all devices and this came up..

before i had clicked that it only this..

so it had now shown something else on the left. so which i clicked on that and i was even more confused as this came up..

So i don't understand why its saying its only 34gb when on the physical disk its saying theres 61gb. the usb I'm using is a 64gb usb and always has been. If i could have some help finding out whats wrong with it that would be great.

Thanks