When I access web pages via Safari on my iPad 2, I found the spell check feature is not functioning as expected. The moment I tap on the word that needs to be corrected, the correction options will appear on the screen only for few seconds and then switch into other options like copy, paste etc. Sometimes, the incorrect word will not be recognized and underlined with red color. I need to read the whole text and pick the misspelled words manually. How can I make this feature work properly on my iPad?