Windows 10: Double accents ~ ´ and ^ only

Hello,I regularly use the French France and Portuguese Portugal layout so that I have fast access to the keyboard layout and accents for those languages. I have no other languages installed on my version of Windows 10. The issue I'm having started about a month ago. Strangely, on the French keyboard I can type éçàù without issue, but I cannot use the circonflexe at all. I press the accent key and I receive two accents. Normally, I should be able to press the accent key to the right of the letter 'p' once and then the desired letter for instance, u and receive û, Instead, I receive ^

:)

 

Acute accent key creates double ´´

So i'm having this super annoying issue where my acute accent key creates double ´´ But only in office 365 and mozilla products.
What's the normal behaviour of the acute accent key? Normally you press it once and nothing appears on screen as it's awaiting the second input, so you press acute accent and then e to get é etc.

I've found older threads on win7 forum and other places with no solution.
asus tp301ua, with windows 10 x64.

 

Acute accent key creates double ´´

- do you mean AltGr ?

What's your keyboard set to?

The Best Way to Type French Accents on Windows (and Linux)

 

Acute accent key creates double ´´

Hi, not a fix, I'm afraid- instead, a pretty much universal rational alternative- freeware

AX - Instant, simple accents and special characters

Choose the language - character set (or add your own); hit a character then your chosen special key and

ç é è û ó all in 11 key strokes I think it was.