Excel 2013. All sheets being automatically changed to Currency format

We have 3 PCs, all running MS Office 2013. On 1 of these machines, it is doing strange things with formatting. If you open a document or try to paste anything into certain documents, it decides everything is currency format and assigns all sorts of wrong formatting to the entire sheet, or the entire document. There may be some cells in the doc that are indeed currency, but only a small proprtion. If I open a new, fresh document and paste into that document, it does not do this, it seems to work normally, only applying currency formatting where it might be applicable. On some larger docs that have this issue, no matter what I do, it just continues to apply these strange settings. I am not a computer or Excel expert, but not completely inept either. It is driving me to despair, I've tried Googling, but can't find any sort of setting that could help to explain this strange behaviour. Any suggestions welcome.

Thanks
Lynchy

Hi, I had the same problem, also with 2013 version. Unfortunately I couldn't find any other way to fix it other than re-build a fresh version of the file.