weird account virial bug ,i think

this issue has been affecting me for a while ,occasionally when i boot up a weird account glitch happens ,to were my username is diffrant then what it atualy is ,but when i go to the manage account section its the same as my atual username,im posting this here due to it being a somewhat gray area when it comes to weather i should report it to Xbox, or Minecraft ,for got to mention ,my capes along with the relatively few marketplace purchase's ive made are gone when this bug effects me