Issue with d.docs.live on Excel. Please help.

Hello. I used Excel for the first time in a few months, and the flashdrive that I use with the Excel files that I usually work with have something strange with it that I noticed today. I have cells with a nested VLOOKUP function that always was linked to the flashdrive (ex: the file would say VLOOKUP,A3,'Fname of flash drive)),etc, and it used to work, but now it says VLOOKUP,A3,'''h t t p s : / / d . d o c s . l i v e . net
/02a804872a57c7d2" (had to space it out due to this site not allowing me to "post any kinds of links"). In any case, for whatever reason, the Excel randomly starting having d.docs.live.net
in any file with a VLOOKUP function of any sort that referenced the flash drive location originally, and I don't know why this was the case. I saw a pop up asking me to sign in and "validate my credentials" one time only, and I x'd out of it not thinking much of it, but it hasn't popped up since, and I don't know if I was supposed to do so or not. In any case, if someone could please let me know what this issue is and how I could fix it, I would be greatly appreciative. Thank you in advance to anyone who can help me out.