Why VBA sometimes reconized the next variable (x1Whole) and sometimes not?

If you seek a string in a formula as xlPart, you always get the string from your function itself (a good idea, btw). There will be a problem with xlWhole: there may be a case (and if the formula is the only thing in the sheet, it is is the case) that there's no match. Find will give an error, if nothing is found, and the formula result will be #N/A.

Below is your code with error handling, resulting in 0 for no match.

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