If you create a board in the Github’s repository project section, once you create a Pull Request, a new issue is added and available to drag into the board from the Add cards button.
So if you create an issue, and then create a Pull Request to solve that issue, it will create a new issue number for each Pull Request created, jumping the order.
Instead I would like to disable this behaviour for the Pull Requests, that is, that when a Pull Request is created, it won’t generate a new issue number.
In case the problem it’s not clear enough, let me make a workflow example:
Let’s say you create an issue, for example issue #1, then you create a branch for that issue and when the work it’s done you create a Pull Request. In that moment a new issue number will be assigned to the Pull Request with the number #2 and it will be available in the Add cards button inside the project.