Encountered an error while turning the page

[Lissoneth]

Hi sir, first of all thank you very much for your tool, it is very useful
I'm having some problems using your code, if I go to the next page and then go back, I can't do it again. Sometimes when I turn to the last page I still can turn down, and sometimes the button can only be clicked twice, and then there is no response.
Maybe I'm doing something wrong, can you help me？

[Lissoneth]

I hope you can answer my questions when you have time, thank you sir very much!

[Lissoneth]

Sir I found the problem. The reason is that the same picture cannot be used. For the convenience of testing, the same picture is placed in my pages, and this problem will occur.