@Genevieve **********
there is nothing like that in any visa rules. That's something the foundation is making up. your VISA was only good for 90 days when you entered the country and you've been on extensions since then..
There is no "you can only get a year of extensions" rule at immigrations for Non-B's based on working at a foundation.
That is between you, your foundation, the immigration office, just like renewing your work permit is between you, your foundation and the ministry of labor.