Issues while typing with Samsung Keyboard

I have an issues while typing certain phrases for example: 1-while typing "8oh" after typing "h" it autocorrect to "88oho" and place cursor behind last "o" so result looks like "88oh|o" where "|" is the cursor. 2-while typing "34-34W" after typing "W" it autocorrect to "34-334-34W4" and place cursor behind last "4" so result looks like this "34-334-34W|4" where "|" is the cursor. It is occurring everywhere like in search engine Google, while typing comments on YouTube and even in this particular window while typing about this issue. It does not occurre in adres bar. It does not occurred while writing without text prediction. It occurred even autocorrect is disable.