Strange annotation section during matching

[gardster]

I made the matching request:

http://router.project-osrm.org/match/v1/car/-73.98082999996642,40.76764000000058;-73.98114000003697,40.76778000002791;-73.9814199999703,40.76829000001442;-73.98139000001274,40.768729999973914;-73.98120000004195,40.76906000000459?radiuses=6;7;4;4;5&annotations=true&steps=true&geometries=geojson&overview=full

In response I have one step with annotation:

"annotation": {
            "datasources": [
              0,
              0,
              0,
              0,
              0,
              0,
              0,
              0,
              0,
              0,
              0,
              0,
              0,
              0,
              0,
              0
            ],
            "nodes": [
              4347550074,
              1792535236,
              1792535234,
              1792535228,
              1825841670,
              1825841669,
              1825841747,
              1825841692,
              1825841744,
              4347550071,
              1825841654,
              1825841748,
              1825841647,
              1825841652,
              1825841687,
              4347550065,
              1825841752,
              1825841712
            ],
            "duration": [
              0.4,
              0.6,
              2.6,
              1,
              0.8,
              1.2,
              0.6,
              0.8,
              0.8,
              0.8,
              0.8,
              0.8,
              0.8,
              0.8,
              0.8,
              0.2
            ],
            "distance": [
              1.887799,
              3.242205,
              3.5787,
              5.318845,
              4.464822,
              6.502462,
              3.346855,
              4.311536,
              4.446879,
              4.449849,
              4.477669,
              4.45405,
              4.462612,
              4.448259,
              4.508641,
              1.90766
            ]
          }

There are 18 node ids and 16 distances, durations and datasources. But, as I understand, there must be 17 distances (for each node pairs).

[TheMarex]

Hrm, yes this looks weird. You are right this should be 17 and 16 respectively. Not sure what is going on here. Investigating.

[gardster]

Problem appears in both sides. For request:
https://router.project-osrm.org/match/v1/car/-73.96537000003526,40.75900000000774;-73.9659099999901,40.75874999999795?radiuses=12;16&annotations=true&steps=true&geometries=geojson&overview=full in response I got

            "datasources": [
              0,
              0
            ],
            "nodes": [
              42432861,
              42442960
            ],
            "duration": [
              5.7,
              0
            ],
            "distance": [
              52.70689,
              0.111226
            ]
          },

so there is durations records count more than expected.