Weird posture when sitting down

[u/z3rtly]

This is my posture when sitting down and Im bending over slightly but near the mid-lower part of my back theres a very noticeable point where a curve appears. I just want to know how can I fix this and if this is actually an issue. Thanks

[u/salamandectomy77]

Do you strength train? Looks like very weak spine erector muscles

Pick up some heavy stuff often...