There is no such thing as a CTR% that will get you banned. Follow the TOS and you can have a 100% CTR.
My CTR is around 20% almost every day. It doesn't mean I make much money because my niche is not all that good. I have been having a CTR between 10% and 40% for several months now. Has never had any issues.
I think the CTR of some pages seems to be very high, which shows "50%,40%" ---- 1. Does the ctr of THAT page always has the high CTR ? if yes, that is not good; else, it is just sometimes it has the "high CTR", it seems to be OK. 2. Donot look at a certain page CTR, you should view the CTR of your overall account ...
It is above the average, but I is not abnormal at the moment. Since AdSense is really contextual, the CTR tends to be usual high.
no problem mate high ctr shows that your site is effect with google ads, brings much benefits to you and google , unless you have invalid click
Your CTR being high is normal. There isn't anything to be worried about that. You just need to make sure to watch out for improper clicks.