Why does my Instagram account keep notify me to verify account by entering some captchas ?

[Nadya_]

even though I've confirm my account through the email I used..
(but my sister's instagram account never notify her to verify account.. it's kinda annoying for everytime i'd like to check my followers or visit my friend's account the verify account notifier keep popping out)
is there any way to make it stop notifying? now the captcha isn't showing and i can't type the things but it keep telling me to type the captcha :|

[Menace]

To make sure you are a real human, not a remote program trying to crack your password(s).

[Kristin]

It keeps saying that to me too):

[Nishan]

Human Verification.