I'm not sure what's up, but you can get around it by manually creating your video and posting it, as described in the FAQs to the right of this forum.
In fact, many people prefer to do it this way because it produces a much higher quality video.
Hey you should once make sure that the full slideshow that you made in photoshop appears in Premiere Elements
And then you should also make sure that your work area bar in the timeline contains the whole slideshow and not only 1:04 of the video.
The WAB (Work Area Bar) has tripped up many, and is a common issue, when the Timeline output is truncated.
Here is a look at the WAB (from PrE 4.0, but works the same in later versions):
The WAB is a great tool, when one wishes to limit the Export, or perhaps the area of the Timeline that Renders. However, many do not even notice it, and fewer understand how it works, or how to use it, and it gets in their way, if something is not set properly.
To the OP - Good luck,