Strange symbol in UEFI boot order instead of "Ubuntu" - is everything ok?

I wiped my SSD and installed Ubuntu from a flash drive. After restarting multiple times, since the computer was always restarting, I decided to boot up without my flash drive plugged in and it worked.

I opened BIOS to take a look at the boot order there was kind of a mesh character that showed up instead of something like "Ubuntu". I then decided to click on load default features to see what happened and saw <null string> below the boot order sign.

Since I was to afraid to let it boot up like that I decided to revert the changes. The computer still works fine with this strange thing but I was wondering if everything went OK.