The irregular nature of those windows in your images and the lack of being able to manually resize them suggest you may be using a window-management minor mode such as golden-ratio (http://github.com/roman/golden-ratio.el) or zoom (http://github.com/cyrus-and/zoom).
Further clues to check:
Do the windows resize themselves to make the active window larger ...
For the Ansible layer to automatically enable ansible-doc-mode and the company-ansible backend, your buffer filename must match one of main.yml, site.yml, roles/.+\.yml, group_vars/.+, etc. See the regex at the bottom of ansible/config.el (v0.200.13) for exact patterns.
In Emacs, you can manually enable ansible-doc-mode for the current buffer with M-x ...
This should be mitigated on the current develop branch because those limits were increased by 10X.
When using undo-tree these variables are increased:
undo-limit 800000 ;; previously 80000
undo-strong-limit 12000000 ;; previously 120000
undo-outer-limit 120000000 ;; previously 12000000
The change is at: https://github.com/syl20bnr/spacemacs/commit/...