Image borders and captions

[redvan22]

Hi,
I have to create and or modify help documents containing images with borders and captions.

I'm getting the images using microsofts snipping tool and for the border, a square shape that I stretch to fit. I add the caption next and then I group all the components so they move as one object.

I've read that the layout option needs to be either "Square" or "Top and bottom", which I set once I have my grouped object, so it moves with the text should more text be added.

Here's the problem:
Some of these created objects move on their own to other locations; up a page, down to the bottom of a page or just disappear all together when additional text is added. I've also noticed that some captions were placed as text while others are placed in a rectangular text area the width of the image above it, this usually happens when I add the caption.

So, my questions are:
What causes the caption to be placed in these two different ways?
Why do the images move around as I noted?

Red.