iOS 10 capitalizes words after commas

What particular version of iOS 10 do you have installed? And on what device? Are you using the stock iOS keyboard or a third party one? Is this just typing regularly or using dictation/Siri?

 

I have never once had this problem, very weird. There must be something else in play as C DM asked.

 

Odd, I don't experience this and can't say that I've experienced that before. What are regional settings set to?

 

iOS will do it after periods here. Sometimes annoying as well, but usually useful.

Any chance you are confusing comma and period?

Do you notice any special behavior when you type double spaces?

Edit: (Haha, see what you mean in your post. What web browser are you using?)

Check Settings -> General -> Keyboard
Have you tried toggling Auto-Capitilization and Auto-Correction to see what happens?
How about the auto replace, anything odd in there?

 

Try removing the keyboard. It probably won't let you without adding a different keyboard first. And then re-add the original one. I'd reboot between these steps, just to be more sure.

 

I've never seen nor heard this happening after commas.