Locked folders

quick question, hopefully somebody can help me.

I unattached my external hard drive and attached it via USB to my Mac to quickly copy my movies into it.

Reattached to the hub via USB. Got back on my Mac found hard drive through my network as usual but here’s the new problem- some of my folders are locked and some of them aren’t. I can’t seem to figure out why.

Doesnt affect playing just can’t add my own jpgs and .pngs to make menu more awesome.

Anybody has any ideas I’d appreciate it

Not sure why this is happening.  You may transfer the files back to the computer, then reformat the drive.