ElevationData difference between api openrouteservice and my own server

Hello, someone know why i have the very different value of elevation between api openrouteservice and my own server? For the same request i have many different elevationData
i have try interpolate but i don’t have the same result, here is an example, thank you for your help everybody

OPENROUTESERVICE [2.73977, 50.396223, 88.2], [2.739538, 50.39676, 90.3], [2.739379, 50.39728, 91.6], [2.739293, 50.397481, 92.1], [2.739028, 50.398122, 95.3], [2.738841, 50.398486, 98.3], [2.738496, 50.39893, 102.4], [2.738286, 50.399154, 104.2], [2.737092, 50.400226, 112.2], [2.736937, 50.400302, 112.5], [2.736902, 50.400311, 112.8], [2.736748, 50.400324, 113.2], [2.736427, 50.400313, 113.9], [2.736229, 50.400277, 114.3], [2.735864, 50.400175, 115], [2.735507, 50.400132, 115.8], [2.735368, 50.400144, 116.3], [2.735153, 50.400194, 116.7], [2.734182, 50.400481, 119.5], [2.733756, 50.400585, 120.7], [2.73356, 50.400611, 121.1], [2.73338, 50.400626, 121.5], [2.731352, 50.400654, 130.3], [2.731165, 50.400643, 131.2], [2.730354, 50.400484, 136.3], [2.729282, 50.400399, 140.6], [2.728853, 50.400336, 142], [2.728527, 50.400266, 143.3], [2.728501, 50.400259, 144], [2.728091, 50.40013, 145.8], [2.727592, 50.399939, 148.2], [2.726535, 50.399498, 153.5], [2.725242, 50.39899, 157.5], [2.724899, 50.398877, 158.1], [2.724735, 50.398843, 158.4], [2.724502, 50.398834, 158.8], [2.724365, 50.39884, 159.2], [2.724118, 50.398899, 159.5], [2.723277, 50.399298, 161.4], [2.722864, 50.399495, 162], [2.722222, 50.399778, 163], [2.721949, 50.399851, 163.3], [2.721765, 50.399881, 163.4], [2.720169, 50.400006, 165.2], [2.719997, 50.400015, 165.4], [2.719696, 50.399999, 166.1], [2.719444, 50.399978, 166.5], [2.719397, 50.400079, 166.8], [2.719345, 50.400196, 167.2], [2.71934, 50.400222, 167.5], [2.719279, 50.400505, 168.4], [2.719012, 50.400479, 168.7]]

MY OWN SERVER [2.73977, 50.396223, 89], [2.739538, 50.39676, 92], [2.739379, 50.39728, 92], [2.739293, 50.397481, 92], [2.739028, 50.398122, 99], [2.738841, 50.398486, 107], [2.738496, 50.39893, 107], [2.738286, 50.399154, 107], [2.737092, 50.400226, 117], [2.736937, 50.400302, 117], [2.736902, 50.400311, 117], [2.736748, 50.400324, 117], [2.736427, 50.400313, 119], [2.736229, 50.400277, 119], [2.735864, 50.400175, 119], [2.735507, 50.400132, 121], [2.735368, 50.400144, 121], [2.735153, 50.400194, 121], [2.734182, 50.400481, 124], [2.733756, 50.400585, 126], [2.73356, 50.400611, 126], [2.73338, 50.400626, 126], [2.731352, 50.400654, 137], [2.731165, 50.400643, 137], [2.730354, 50.400484, 143], [2.729282, 50.400399, 147], [2.728853, 50.400336, 151], [2.728527, 50.400266, 151], [2.728501, 50.400259, 151], [2.728091, 50.40013, 155], [2.727592, 50.399939, 152], [2.726535, 50.399498, 159], [2.725242, 50.39899, 159], [2.724899, 50.398877, 161], [2.724735, 50.398843, 161], [2.724502, 50.398834, 161], [2.724365, 50.39884, 161], [2.724118, 50.398899, 163], [2.723277, 50.399298, 165], [2.722864, 50.399495, 165], [2.722222, 50.399778, 165], [2.722069, 50.399823, 165], [2.721758, 50.399876, 165], [2.719997, 50.400015, 171], [2.719393, 50.399969, 160], [2.71937, 50.400077, 171], [2.719345, 50.400196, 171]]

Hi,

it is expected to have slight differences between a local instance and the public ORS API, because we preprocess the OSM planet file to speedup our graph builds. During this preprocessing, we already consider elevation.

If you notice some significant differences, there might be a bug.

Best regards