onCheckCanDrop method issue with StaggeredGridLayoutManager and setFullSpan

[isNoobDev]

Hi,
I have a StaggeredGridLayout RecyclerView with a spanCount of 3.
The last item if a footer and it's set as:
(itemView.layoutParams as StaggeredGridLayoutManager.LayoutParams).isFullSpan = true

by doing so, the method onCheckCanDrop is triggered multiple times when i move an element on it.

Let's suppose I have 5 items plus the footer, when I move the 5th (index 4) item to the footer (index 5), as shown in the screenshot, the onCheckCanDrop is called several in this way:

onCheckCanDrop from 4 to 4
onCheckCanDrop from 4 to 5
onCheckCanDrop from 4 to 4
onCheckCanDrop from 4 to 5
onCheckCanDrop from 4 to 4
onCheckCanDrop from 4 to 5
onCheckCanDrop from 4 to 4
onCheckCanDrop from 4 to 5
onCheckCanDrop from 4 to 4
onCheckCanDrop from 4 to 5
onCheckCanDrop from 4 to 4
onCheckCanDrop from 4 to 5
onCheckCanDrop from 4 to 4
onCheckCanDrop from 4 to 5
onCheckCanDrop from 4 to 4
onCheckCanDrop from 4 to 5

as you can see, the draggingPosition remains the same while the dropPosition switches between 4 and 5.

This is my adapter https://pastebin.com/pSSajdfz

Thank you in advance