The last Foursquare for BlackBerry 10 brought a ton of new changes but it also brought a few bugs with it and a new update rolling through BlackBerry World looks to correct those. It's just a small batch of fixes but if you've have issues with the 'mark prior read' or 'delete prior' options, you'll want to make sure you grab this one.
The update should be live for most folks right now, if you're not seeing it you can try searching for Foursquare or refreshing BlackBerry World to help it along. If none of that works, just sit tight. It'll come along soon enough.