Why do girls always cancel after praising me?

Some girls always cancel after praising you. So this girl doesn't want you to know that she likes you.

If you like it occasionally and cancel it, it means that the girl's hand slipped, not intentionally. If you often like it and cancel it, it means that this girl cares about you very much, but she just doesn't want you to know.

Explain what you said, girls agree with you, so they often praise you, but she doesn't want you to know. She read your report and didn't want you to know. She agreed to your conversation, so she cancelled it at once.

So no matter what the situation is, this girl is contradictory to you, paying attention to you and not wanting you to know.