It is unclear to me what the bug is. Your screenshot doesn't really provide any information about what controls you're using and how you've configured the various layout options like Anchor, Dock, Padding, Size, AutoSize, etc. Are you using containers to group controls? If so which ones? What is the z-order that will be used to control the final layout during rendering? A sample winforms code block that replicates the issue would be the most beneficial.
Also please identify what runtime you are targeting.