I do not understand why but I have experienced this a number of times.
1. 2 SXT's point to point - configured bridge and station bridge using nv2 routerOS 5.24
2. bandwidth test shows - 100mbps +
3. real-time internet bandwidth shows increased latency at 6 mbps+
5. Noise floor -117 dbm, tx/rx connectivity - 63/67 dbm