typing problem: by typing space, it deletes my previous word

My Macbook pro is: Macbook Pro M1 15inch.

I have problem that any time you typing a new sentence, after completed the first word, you tab spacebar, then the first word is deleted. It is so annoying that i must re-type the first word again.

Plus, when using confluence document, after create a new table, right after i completed the first word and tab on the spacebar, the word also deleted + the table automatically create a new column and push every row's contents to the right side.