Understanding Profiler: Profiler Memory Shows GC Allocation but Overview does not

Please help me understand something. In my profiler screenshot below, I seen the Memory section that there is regular GC Allocation being done (which curiously enough coincides with Mesh Memory increase) – but it goes back down.

However, in my overview section, the is zero GC Alloc being performed. What’s going on here? Should I be concerned about these GC Allocs? Is there a memory leak? Using Unity 2017.3.0p3

I also encountered the same problem, but I solved it.
The detail of the GC alloc is displayed by pressing the Profile Editor button on the right of Profiler’s Deep Profile and probably this is the GC being used for profiler drawing, so if you close the profiler GC Alloc will not be done.