Custom date attribute does not update in back end, but not in an echo. Cache issue?

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Hey,

I've got a page list of events on a page.
Each event has a start and end date attribute, these attributes are both used to display the date and order the page list.

Now I have an issue where if I customise the dates after I've created an event. The position of the event in the page lists changes. But the echo'd attribute does not change.

I thought it's a possible caching issue, but it's all turned off.

Any ideas?