tilebelt | simple tile utilities | Map library

We are trying to incorporate vector tile endpoints into a back-end framework using mapbox-vector-tile-java to encode geographic features into Vector Tiles. We have it all mostly working except for some odd behavior where the rendered features are placed at latitudes way higher than they should be. When zooming in the features will jump to lower latitudes until finally getting to pretty good accuracy at really low zoom levels. For example, my data is of New Mexico counties. On initial page load the counties all render in Canada. When I zoom in to zoom level 2 they will jump down to Southern Canada. The more I zoom in the more close they get to where New Mexico actually is. Does anyone know why I'm seeing this behavior?

1. Geographic features from the database are in EPSG:4326.
2. JTS is used in conjunction with mapbox-vector-tile-java to handle encoding of data.
3. Converting URL based xyz tile positions to tile bounds uses the exact equation that Mapbox uses for such conversions as referenced in MapBox's TileBelt.

https://localhost:8443/app/location/data?x=0&y=0&z=0&config={some:json}