Check your dimensions. Is it possible you've left a dimension unaccounted for in your target module? If so, it will sum all instances of the Isla Negra Sea Shore list item on the unaccounted dimensions. You may want to screenshot the pivot on the source and the destination so we can see it.
Also, you say the module is clearing before you import. You may want to test that too.
One approach to resolve issues like this via testing is to create a saved view that has minimal dimensions, for example import to one product. Then see if in this import there is a similar issue, then when you scale up to the full list of dimensions you can evaluate what is contributing to the error.
It could be very likely that this issue is to do with the formatting of the time dimension which may be causing aggregation.
ok if you have only one version filtered in the source then it should work.
One potential issue I see from the mapping is that you are mapping the customer using the list itself while it is a numbered list. This is known to cause issues. It is better to create a line item "customer code" that will contain the code of your list (hopefully it has one ?) and use that line item to map the list.