Instagram rule concerning comments on third-party apps like us is different than on their app.
That is probably why you encounter this issue on Iconosquare but not on Instagram itself.
Even if you are still able to comment on Instagram we would recommend you to be extremely careful with the number of comments you post.
We can’t give you a figure concerning a limited number of comments as Instagram doesn’t communicate them.
What we can tell you is that behavior is the most important aspect to decide if a user must be blocked or not and Instagram takes it very seriously.
We don't know neither how long you will be blocked but you should be able to use all other functionalities of Iconosquare, only your comments are blocked.