You're not the first person to report problems with Kingston cards. I don't know if it's the whole Kingston brand, or just certain models, but Kingston cards have been troublesome for a lot of people when used in Raspberry Pi computers.
I've had good luck with Samsung (EVO+, EVO Select and Pro), Silicone Power, Transcend and PNY. The Samsung EVO+ cards are significantly faster and are pretty much my GoTo cards for Pi computers, although there is a newer EVO "Plus" model now that some have reported as being slower. I bought a couple of those, but I've not had time to test them yet (in addition to the normal holiday madness, we are moving as well).
You can reformat your cards with the SD Association's SD Card Formatter to restore full capacity.
SD Memory Card Formatter 5.0 for SD/SDHC/SDXC
My mind is like a browser. 27 tabs are open, 9 aren't responding,
lots of pop-ups...and where is that annoying music coming from?