old profile pics

while switching accs i guess i had poor connection and idk how but for a bit my pfp was a pic from probably 8 YEARS AGO which im sure i've never used as a pfp in tiktok. what the hell was that??? does that have smth to do with my google acc, i may have used that pic as my google pfp but why did i see it on tiktok?? im really confused but more shocked