FirstResponder ignitable only in a little piece of a textView

I have this textView in the inputAccesoryView, the case is that the textView have 80 of height and all the screen of width.

Problem: the finger will init the firstResponder only within the first 10 - 30 of height top to bottom. if you got the idea that means that the first 10 top pixels of the textView is not going to ignite the firstResponder, the space of ignition is 20 pixels and below of that. Meaning that at this point the remaining 50 pixels doesn't work as well like the first 10 top.

Have anyone ever experienced this kind of behaviour? super weird.