Hey sSue!

The highlighted part is just what my thoughts are, and that isey are expressed clearly in the original sentence in our group.

Tense mismatch: "thoughts are" (plural) vs. "that is" (singular). Also consider clarifying what "the original sentence" and "in our group" refer to. (I feel past tense for the second part is likely correct here.)

The only difference is that you described the word "lost", which is referred to in the second sentence, as a "notional verb", but I stateddescribe it as a "predicate verb(谓语动词)" S", so I think it is just a misunderstanding.

But it doesn't matter, which indicates that you are extremely right and I also didwasn't make mistakesn.

I don't think it's possible to be "extremely right": you're either right or not.

So we are both right haha.

"haha" is suitable when casually writing on the Internet.

But it doesn't matter, which indicates that you are extremely right and I also didn't make mistakes.

This is a little bit awkward, you could try:
But it doesn't matter, you are 100% right and my suggestion too was also not wrong.

Thank you a million.

Thanks a million.