I'm trying to join a new campaign, but every time I try to add my character the wrong one is added.

I'm trying to add a fourth level character, it's a copy of another higher level character sheet. In the character select screen I highlight the 4th level but on the next screen it shows the higher level character has been added to the campaign. 

I've tried this over mobile and on the computer and gotten the same results. 

There is a bug adding characters to a campaign if it has the same name as another, older character. Change the character's name, see if that works.