^I’ve had cards (especially older ones) that have had loose lock tabs.
When I’d put the ‘unlocked’ card in a card slot, the lock on card would get pushed into LOCKED position.. and then when card was pulled out of slot, the lock would get pulled back into UNLOCKED position. Tricky.
It took me a while to figure out what was happening.. then I taped the lock tab secured in UNLOCKED position on card and problem was solved.
YMMV.