Adding a title without it overlaying on a photo

Long hold on the title clip.

Drag it down to the main video layer.  The clip should push all of your other slides out to the right.

The timeline automatically populates all holes, so the clips will shift in, or push out depending on the edits you make to the main timeline.  You can add other layers for multiple images too (not just type over images)

hth

In my experience with IOS Rush, when you create a title, it by default attaches itself as a connected clip to the image the below it.

To make it a "regular" clip, try:

Create the title, it will appear over an image in the timeline.

Press down on the title clip to select it and drag it down to a point between two images on the timeline, and release.

Once the Title is on the image track and no longer connected to a particular image, press down on it and once selected, drag it to the start of the timeline.

MtD

As long as your title is on the main video track it will function like a video or photo clip. There will not be a video behind it and it will appear as it's own standalone clip.

I'm not sure what you mean when you say "when I move a photo another one pops into its place". But positioning and re-positioning a title clip is not different than positioning any other clip.