Hello @rising5561
Thank you for providing the additional informaiton.
Can you please share the screenhot of the issue regarding the W3 Total Cache, so I can be positive of what you are stating and see what is the before and after result?
As for the black line behind the expanded items in the global navigation disapearing, can you cofirm that the problem is also related to the W3 Total Cache? Meaning if you disable the W3TC with the latest WP version does the problem persist?
Thanks!