I know that the Destiny of White Snake was temporarily pulled off the air while they make character adjustments so that may have something to do with it. I'm not sure about the others. I'm currently watching the 2018 version of A Step into the Past. It's so good but only 15 out of 40 episodes are subbed. 

http://www.dramapanda.com/2018/08/two-dramas-abruptly-taken-off-air.html

This is the article I read about why it was pulled. 

 CherryBunny:

That article isn't showing up.

http://www.dramapanda.com/2018/08/two-dramas-abruptly-taken-off-air.html  new link

 ataezing:

https://www3.watchasian.co has been providing subs for The Taoism Grandmaster til about ep 30 but I’m not sure if they’ll be continuing. 

this is why im frustrated don't upload the drama if your not gonna sub it fully you know?