i have in my winbox the mac address for my rb433ah which i log into all the time
today i connected my old 333. i looked on the back at the mac address sticker and the macs are the same as those of the 433ah
wait, the stickers are identical? or the MAC on the sticker of the 333 is the same as in the Winbox scan of the 433? Maybe you have some interesting setup, that makes it find the other Mac instead?