Child bone gets skewd in anima2d

Im trying to make skeleton in anima2d. First bone works well but when i attach a child to it, the child gets skewd when i try to rotate it. It goes what seems to be rotating in a 3d way, like in these photos. Actually all the child bones do the that , only the first bone seems to rotate normally. Is there a box that i forgot to tick or whats going on? This has not happened to me with unity 2018 version, but in 2019 version this happens (not sure if that is the reason though.)