My strength is 15 but it is giving a +3 modifier. I checked the rules and it should be a +2

Can you post the URL of your character sheet, so we can give a look?

https://www.dndbeyond.com/profile/Chrisj1977/characters/737689

I am new to this so please be gentle lol

Always gentle.

You put 15 as your base STR score, but, being a Dragonborn, you have a +2 STR bonus. So a 17 as the total.

Shouldnt it be a +2 not 3?

I am looking at joining some groups on roll20 so I want to get it all right

No, 17 gives a +3 modifier.

Your right.... I didnt take the bonus into account lol my bad thank you

No matter what i put it makes my strength the same number each time. I have a ten strength but it makes it 3 each time.

Quote from WazerWifle >>

No matter what i put it makes my strength the same number each time. I have a ten strength but it makes it 3 each time.

 You have to clear the Override box.