Hello Hnguyen,
You have defined "AC 1" in two extra sources. This is simply wrong for this application. Instead you should define AC 1 in the input source. By the way it's bad practice to hide the AC-value in a V-sources as you did.
I have corrected your schematics and uploaded it into your folder. Simulate with my files and you will see that everything is OK now.
Best regards,
Helmut