Repeating first letter when typing on Samsung Galaxy

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My Samsung GALAXY S6 edge phone has started to do repeating first letters when I use the stock Samsung keyboard that it came with. Not for every word all the time but occasionally. I actually have to finish typing the word and then go to the front double letter and delete one of them.

It also won't let me type a letter after a bracket without it automatically on its own adding an extra bracket "(". The only way I can stop this is by turning predictive text off but this also turns the auto correct spelling off which is not helpful.

Here's the interesting thing. My keyboard is having no glitches now as I'm typing into this android help post. However when I switch to my fb app and try to type a message, or when I use the stock email app to try to type an email, it won't work properly.

Any idea?

Please help.

Thanks!

I didn't find the right solution from the Internet.

References forums.androidcentral.com/ask-question/738185-repeating-first-letter-when-typing-samsung-galaxy-keyboard.html

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