Missing altitude data in Norway

[broutertry]

I have created with the attached gpx-tracks these routes.

https://brouter.de/brouter-web/#map=9/63.1456/9.8451/osm-mapnik-german_style,terrarium-hillshading,Waymarked_Trails-Cycling&lonlats=11.270669,59.097615;11.287525,59.126287;11.193364,59.179995;11.19205,59.239683;11.15407,59.271582;11.017356,59.249827;10.953839,59.205273;10.80478,59.200324;10.792363,59.219927;10.824315,59.236653;10.783544,59.307145;10.805583,59.333662;10.776606,59.362399;10.664645,59.360462;10.650975,59.394881;10.744088,59.544488;10.742588,59.654735;10.847292,59.721383;10.811088,59.766346;10.814121,59.917483;11.060537,59.961478;11.122777,60.06248;11.214451,60.134743;11.169261,60.147813;11.164307,60.220469;11.201179,60.24969;11.167829,60.301296;11.229202,60.324046;11.194473,60.3836;11.239613,60.399243;11.243163,60.536452;11.295182,60.602192;11.213927,60.626858;11.085241,60.758331;11.106608,60.784265;11.027686,60.799512;10.941619,60.884799;10.710378,60.907446;10.649874,60.980391;10.473175,61.046228;10.477234,61.102951;10.40718,61.164478;10.458615,61.248524;10.284127,61.288287;10.302329,61.311951;10.179232,61.430762;10.221378,61.471726;10.16172,61.525912;9.76228,61.591118;9.722501,61.620246;9.723355,61.664734;9.536731,61.682264;9.533784,61.769145;9.375056,61.783919;9.099318,61.865536;9.009152,61.907373;8.959372,62.061207;8.913302,62.079779;8.942041,62.115306;9.138578,62.075058;9.290463,62.112421;9.378773,62.175699;9.563319,62.2086;9.530401,62.238884;9.599382,62.280523;9.641027,62.380612;9.633621,62.417296;9.574259,62.451762;9.599345,62.553489;9.644424,62.603844;9.872646,62.664562;10.007246,62.804396;9.957652,62.836496;9.83175,62.848143;9.779554,62.936623;9.790932,62.975069;9.711794,63.018227;9.708206,63.141301;9.790288,63.206695;9.777097,63.235034;9.813363,63.26497;10.01685,63.268128;10.068751,63.291413;10.069262,63.326757;10.318575,63.324998;10.357482,63.353001;10.314882,63.381985;10.395319,63.427085

https://brouter.m11n.de/#map=7/63.277/10.129/osm-mapnik-german_style&lonlats=10.395319,63.427085;10.314882,63.381985;10.357482,63.353001;10.318575,63.324998;10.069262,63.326757;10.068751,63.291413;10.01685,63.268128;9.813363,63.26497;9.777097,63.235034;9.790288,63.206695;9.708206,63.141301;9.711794,63.018227;9.790932,62.975069;9.779554,62.936623;9.83175,62.848143;9.957652,62.836496;10.007246,62.804396;9.872646,62.664562;9.644424,62.603844;9.599345,62.553489;9.574259,62.451762;9.633621,62.417296;9.641027,62.380612;9.599382,62.280523;9.530401,62.238884;9.563319,62.2086;9.378773,62.175699;9.290463,62.112421;9.138578,62.075058;8.942041,62.115306;8.913302,62.079779;8.959372,62.061207;9.009152,61.907373;9.099318,61.865536;9.375056,61.783919;9.533784,61.769145;9.536731,61.682264;9.723355,61.664734;9.722501,61.620246;9.76228,61.591118;10.16172,61.525912;10.221378,61.471726;10.179232,61.430762;10.302329,61.311951;10.284127,61.288287;10.458615,61.248524;10.40718,61.164478;10.477234,61.102951;10.473175,61.046228;10.649874,60.980391;10.710378,60.907446;10.941619,60.884799;11.027686,60.799512;11.106608,60.784265;11.085241,60.758331;11.213927,60.626858;11.295182,60.602192;11.243163,60.536452;11.239613,60.399243;11.194473,60.3836;11.229202,60.324046;11.167829,60.301296;11.201179,60.24969;11.164307,60.220469;11.169261,60.147813;11.214451,60.134743;11.122777,60.06248;11.060537,59.961478;10.814121,59.917483;10.811088,59.766346;10.847292,59.721383;10.742588,59.654735;10.744088,59.544488;10.650975,59.394881;10.664645,59.360462;10.776606,59.362399;10.805583,59.333662;10.783544,59.307145;10.824315,59.236653;10.792363,59.219927;10.80478,59.200324;10.953839,59.205273;11.017356,59.249827;11.15407,59.271582;11.19205,59.239683;11.193364,59.179995;11.287525,59.126287;11.270669,59.097615&profile=trekking

In both cases, the elevation profile has large gaps. What is the problem?