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Why Does My External Hard Drive Change From Mac To NTFS By Itself?

I would post screenshots but I am currently backing up my backup hard drive (lol) to another drive so I can reformat it. Anyway, today I plugged in my Toshiba Canivo 1TB external to do some organizing. I went to delete something (Cmd+Delete) and nothing happened. So, I tried to drag and drop it to the trash and got a message saying the file cannot be delete. That's weird, I thought. So, I open up disk utility and discover that my external hard drive decided to change itself to NTFS format on its own. I tried ejecting and reconnecting it - that didn't work. I tried rebooting - that didn't work. I thought my USB hub could possibly be an issue - nope. The only things that have changed since I last used my external is that I changed my MacBook's battery, put in an SSD, and upgraded to El Capitan. I can't see how any of those could cause this but I figured I'd mention it. Has anybody else had something similar happen? Thanks.