Pavers do not sink because the material was wrong. They sink because the base under them was never built to hold. What you see on the surface — the dip, the lipped edge, the puddle that never drains — is the last step of a problem that started the week the crew skipped a compaction pass.
That is why the low bid is expensive. It is not cheaper work; it is the same work with the invisible half left out. The savings last until the second wet season.
What makes it worse in Longboat Key: Salt air and tidal groundwater attack an under-built base from below. On the keys, a deck installed without a separation layer loses its fines within a couple of wet seasons and starts to settle at the perimeter first.