Help with this sentence

OR

"If I'm mistaken, could you please correct me? "

I do not understand why is wrong, I used the present perfect, as you know is: I + have + preterite

Help with this sentence

Dear I think it is better to be: "If I've Mistaken, Please ,help me to correct my mistake."

If I am mistaken, could you please to correct me.

mistaken is an adjective, not a verb

Or you could say

If I have made a mistake, could you please correct me?

Help with this sentence

Hi Matthew,

I saw your post and wanted to give you my personal opinion!

I think this is what you mean to say:  If I have been mistaken, could you please correct me?

However, it sounds a bit stilted. It sounds more natural to say:

Let me know if I have made a mistake.

Please correct me if I am wrong.