That is really strange, I've never seen results go up like that in a matter of weeks without large doses of supplements. I'm actually stumped to be honest. Your blood tests results look like you've responded well to treatment but if haven't been taking any?????
Centrum multi vits wouldn't normally be strong enough to do much of anything anyway but am wondering if something in them may have possibly blocked something or interacted with something where your levels increased once you stopped taking them. Can't imagine a virus would have such affect either?? Baffled lol
Maybe the Vit D is the most likely. Have you had levels tested recently and possibly calcium? Vit D is one of the ones you don't want to overdose on as would cause hypercalcemia and possibly symptoms that would feel like a virus and maybe affect the way your kidneys process stuff like b12??? Your folate wasn't hugely low though. If they were high strength, what dose were they?
Ferritin can go higher if have infection or virus.
I'm no expert on vits mind you so just stabbing in the dark to be honest so you would be better asking others here with more experience like SeasideSusie , shaws , Clutter ?