My instagram follows people at random.

so before i found out about this site, i tinkered with a lot of sites that help you get followers and likes (instatrain and all that junk)

so i stopped after a bit.

but now my instagram automatically follows people?

im not trying to follow them, instagram does it.

now, this is my "play" account i use to study bots and stuff, so it doesnt really bother me.

BUT

i know someone out there is making me follow them, aka, they are making money off my account lol

yes i changed my password, yes i changed my username too.

how can i find out how to stop them?

Sorry if this is obvious, but are you sure that it is not people you have requested in the past and forgotten about which were set to private and they have only just accepted your request now, therefore you are newly following them?