Odd Formula errors

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I have an automated request sheet that we've use for over a year.

Example of a request from an entry on line 2: =VLOOKUP(Requestor2, {Contact Sheet Range 2}, 5, false) - it looks up the requestor (lrequestor from line 2/"requestor2), and cross references the "contact sheet" to find their supervisor (5) and then sends the request for approvals.

Suddenly, it's changing the formula on it's own: - this is an example of a form entry that is on line 1 - =VLOOKUP(Requestor38, {Contact Sheet Range 2}, 5, false) it's pulling the requestor from line 38.??

This is also happneing on another calculating sheet - it's pulling lines well below and not calculating correctly -

HELP!

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