The slides are sorted by date, just like blog posts, you can change the published date of the slide posts to rearrange the slides. There are also some plugins that add drag and drop sorting which can come in handy.
There are some extra paragraph tags in the caption, this is probably because you wrapped paragraph tags around the excerpt, which already has them by default. Remove those from your template and that should help.
Another issue is that your theme is zeroing out the lineheight which makes the text very short, add lineheight to the style to fix that:
.meteor-slides p {
background:
transparent url('images/background_excerpt_slides_.png') repeat top left;
opacity: 0.6;
bottom: 0;
left: 0;
color:
black;
margin: 0;
padding: 5px;
position: absolute;
text-align: left;
width: 100%;
line-height: 20px;
}
It looks a little odd with the light BG on white with some of the slides being portait mode, maybe a dark BG for the captions might work better?