ST ---
We have the thin pavers from Old World Pavers.
The perimeter/edge pavers are "cemented" to the underlying concrete with some type of epoxy ... (you'd have to call them to find out).
It wasn't totally clear from your post whether your 'loose' pavers were the cemented ones around the perimeter or the interior pavers.
In our case, the 'interior' pavers are not cemented down. There is a very fine silica sand that is swept into the cracks between the pavers and this is what holds them together. We freshen up this silica sand once a year. These pavers do get loose as the sand gets washed away over time.
Hope this helps....
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Maryland (DC Suburbs) - first 51 years 
The Villages - next 51 years 
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