Why is Excel reading this as a number and not text

[Want2BExcel]

I have this problem with some data.
I have a table containing serial numbers and a lot of other data. The table is created through a power query that pulls the data out of an access db.
In the Access DB the data is entered as "short text", because serial numbers often includes letters.
In the PowerQuery the data is also recognized as text "ABC"

and loading it into a table, where the formatting is "Standard" and I change the whole column to be formatted as "Text" (which doesn't help). I tried formatting the columns to text before loading the table, but when loaded it is again "Standard".

The table has more than 5000+ rows but for 8 of these rows the data is a very long serial number, only containing numbers. For some reason Excel treats all cells that contain only numbers as numbers and not text and for these 8 cells it creates a problem because of the length. Excel is putting in a comma (9,88........) and because Excel can only store up to 15 significant digits. It converts any others after that to zeros ("0"). But those last 3 digits, if you look at the serial numbers in green, is exactly thoos 3 that makes every serial unique.
This is a problem for me in other parts of my workbook where I use a COUNTIF formula to verify that there a no duplicates in any serial numbers. But because of Excel's way of handling the data in those 8 cells I get a result of 6 duplicates, which is incorrect.
Picture1 serial numbers in question:

Picture2 the format problem:

Any ideas how to resolve this?

 

[Fluff]

Duplicate to: How can I force PowerQuery to load the table formatted as "Text", even if some cells contain only numbers?

In future, please do not post the same question multiple times. Per Forum Rules (#12), posts of a duplicate nature will be locked or deleted.

In relation to your question here, I have closed this thread so please continue in the linked thread.