That forest area was in two parts(small section near Lienerweg was apart from main part). Fixed it. Forest areas should be tagged as landuse=forest `landuse=forest` (if forest is being maintained) or natural=wood `natural=wood` (when it is not maintained). On both cases use wood=* `wood=*` to indicate what type of trees grow in that forest. Another strange (and wrong) thing in that area is usage of layer=* `layer=*` tag. It should not be used on areas like landuse and natural. Take a look at: http://wiki.openstreetmap.org/wiki/Key:layer

That forest area was in two parts(small section near Lienerweg was apart from main part). Fixed it. Forest areas should be tagged as landuse=forest (if forest is being maintained) or natural=wood (when it is not maintained). On both cases use wood=* to indicate what type of trees grow in that forest. Another strange (and wrong) thing in that area is usage of layer=* tag. It should not be used on areas like landuse and natural. Take a look at: http://wiki.openstreetmap.org/wiki/Key:layer