I have experienced this many times. When I add a Chinese sentence into the search, and then click on a character to learn its meaning, when I press the back button to return to the sentence and select a different character, I find that the search has changed to the previous input.
So suppose my first sentence is: 你叫什么名字. Then I delete the sentence in the search, and paste a new sentence, for example 今天天气很好, and I select the character 气 to learn its definition. When I press the back button, the sentence 今天天气很好 has disappeared and is replaced with the sentence 你叫什么名字. This bug so common it's basically expected, so I thought I'll write this.
So suppose my first sentence is: 你叫什么名字. Then I delete the sentence in the search, and paste a new sentence, for example 今天天气很好, and I select the character 气 to learn its definition. When I press the back button, the sentence 今天天气很好 has disappeared and is replaced with the sentence 你叫什么名字. This bug so common it's basically expected, so I thought I'll write this.