Convert titles from 25i to 25p ???

Titles do not really have a frame rate. In the Inspector, they should show whatever frame rate the current project has.

Did you create the project with Automatic settings?

Select the Project in the browser and press Command-4, or press Command-J if you have the project open in the timeline.

What do you see in the project properties? Does it say 25p? 25i? Something else?

What are the project properties? Post screenshots of the project settings and the clip settings. Where are you setting the titles identities as 25i?

Use Cmd-J for project properties and change the settings to this