Anyone seen anything happen like this before?

At design time in Axure, my repeater looks like this:

At runtime however, all is working fine:

The Item Loaded code looks like this:

The data is all pretty reasonable too:

Note that - what clearly looks like some kind of UID in the design-time image squares is absolutely nothing to do with me whatsoever - I have no idea where those numbers came from.

To avoid any confusion - the issue I am asking about here is the weird labelling in the repeater at design-time.

(other changes between design-time and runtime - such as the arrow heads and different order of the content - are deliberate)