why does the text pointer ebhave abnormally?

in case i want to delete a character somewhere in the middle of a long sentence. i tap there and press the backspace key. it removes dt chadacter bt however then it moves to the end of sentencs. it is so much annoying. please provide a fix for it. i use samsung galaxy tab 2 . also please provide next button and a left right pointer movement button. thank you

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