Ok this is to tell you why it is very glitchy to search in topic (especially the drawing one ):
It is trying to scroll up all the way to the first post!!
That's why all the posts gets very glitchy and it's hard to type!! I don't know if this happens to you, but it does for me! I use an iPad by the way
A way to avoid this:
Simply just look at the bottom right corner and there should be a button that looks like this:
Simply click top to go to the first post! Then try to search! It won't be glitchy!!