[MT-AU Public] High distance numbers on short wireless links

We have a couple of short range Mikrotik wireless links, in the range of a couple of hundred metres, they are running 802.11 protocol and have good CCQ and SNR, however I have noticed that the distance shown for the link is high, around 25km, but everything else is correct. The sync speeds are also good, however we are noticing some strange behaviour on them from time to time which indicates high latency and packet loss. Possibly it's interference, but if it was sporadic I would have thought the distance indication would be more accurate most of the time when it was working OK and had no interference. Being that the stats look good but the distance looks bad, does anybody have any suggestions on what to look for on these ? Thanks Paul